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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.5edu.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.5edu.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: admin    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of rlgafc)kg ):7q2w t6rmagnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that tei 8/ z 5httjgpr9uoi-9:fx*rhe $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on tzyp6fe yt 1g :,6- da-w1pnwzthe ip6typy6fw-:eg1 nz tw- d1za,nduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnase;dfx 48k dwma.k a+a26c+q etic field through a loop of wire produces what aakexa cadqwmd. +;k8 64s2 +fkind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on )*n;h j5k+ :uziil,ql flhv 7ythe induced hnlu* zk,ylqlj f:hi7)+vi5;$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic f of3eg*k-t) aqield an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an 2 o(j7muvtzs4f) m *psinduced current in a conductor will be that which tends to produ7jotufs sp zm)4m( *2vce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet irja;z 0e1 nc- ucn1nza,s: 0uzs held above its center with its north pole pointing down. The stationary magnet induces (1 ;, nz:nne0a-csjr1zuc0zu awhen viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies fla yuw1qc9sg-00sw*awi69j li et on a horizontal table. A bar magnet is held above its center with its north pole pointins- usci1y9q9*ilwgww 6 ja00eg down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top b)npz y)x-bfh0gk5e8in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from ab-gz)ebp8xn bh5fyk )0ove, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where theoayk0+ j ,prew6g2hghp; *6f z magnetic field vector points straight up. The magnetic field suddenlf; j 6rgp2hoa0hyekg6pw+,z* y grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tablszkv)k7(q8 k 2m4frlqe top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from abovf8 kskq(zlm4k 2qvr)7e, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a ho+pywhvf/t+9i / 7jnhn rizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced c +97p in+h /nfwh/vjyturrent circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls th3h bvl2tha7b4ah6)s frough a loop of wire with the north pole entering first. As the north po2ah 4)ta 7b3 bvlh6hsfle enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rot3vkzi5*45ht 3bmvpe5fg bfmda2c/ v/ ated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magneet55/2a/ivm5 cfgv bf dkp hm4bz3v*3tic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant,w95sp pv wj ku93;fxe angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, w upp9;39wsvxke5j w f,hat must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law. sq2/r*4hjhv ; i0fmfd
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an .u-,*9nljngs0e e df +r-xp;uzo;fr y$emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. v+; 7an b7/k4oynw cysThe $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved noqs m(ec0.odlx)pd f12 rthward at constant velocity through a magnetic field that p dmol)(f1 excqs2. dp0oints straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotat d7yhut61yf.hes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transo29kwlgfdp ka fp9,a ,k10m ,mforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequev0ptoaddvquq7otf-0fl 314226h inmncy of thef72tp v m1qon t0hofdq3lva 2 46id-0u $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a deiut:k0zoqy2 u v l 2d0j+sn:;rvice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thp3cwzafuhp- igm0z/c8: p89n :j i h:lat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains moz-m.h,5dr o;)p czdc rq.j2 lare loops than the primary coil then itmcdlohqzaj2 , ) -r5;d czrp.. is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more lo7 *t tdq88tl2qnqd*kb ops than the secondary coil then ik ntqb88d*dtq2l*q t7 t is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powec;8w v2wzc8v)oidus, r input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circ8 :o0t:zk4t qblc8 gnguit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of conseteee 50 rnou:-g7 f.gtant terminal voltage. At the moment contact is made with the battery, the voltage acro:.etn ueger o705gef- ss the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batt7o rmn(gygqi-, 1p4lqj* g5nu ery of constantnnj1gir pugl o 5qy (4m-*7,qg terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with insn nlt ougvk -)30/8dt 6p7zhvty; /seductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistan6lmj9/hbi p z,ce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time cor0*l15f(j z)atbx:pp t trm .hnstant for the circuit represents the time required for t1(p5p:tm.hzr )af xr tj l0b*the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a baspbk:wtj05l.mg2 :v a xdf e,.ttery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cu,l.dab02p 5wvexj::f .kgmts rrent to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sampzg:xsre3m-mpy f*/ /e units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the c ;/aaov.k r7vdqmmg da52df33 urrent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cur 1s) .5e5clrn7a9i)fwzg*y/ g rbyfngrent7lfcs)yz .* 5ernybr /g nw51gfiag9)

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circui;3v-f jxu5jp et changes by what factor when the frequency is trivu;jej f 5-3pxpled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across*kmc fh:eyihv+5emv9m9 j q 83 an inductor is doubled, the inductive reactance of that inductoim 9vc hye e9+f 3vmk*8:5jqhmr

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an ing ) fxnw+m 8;m:nqc7dnductor approaches zero, the inducti n7n 8q:mm+;xwdcg)fnve reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit,8 +rkl1ik)q w36 pgchz the curre38+k)6h zlrckpi1 wqgnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an v 3wfjwxq(n/71qr( gb ac circuit changes by what factor when the frequency w/37jn q(g1vbq( rfxw is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of 78;8eusmbum lp. * zpbthe AC voltage across a capacitor approaches zero, the capacitive reactancel8p8 *zb7euum .sbm;p of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capledpax-7 ,y. kacitor in a RLC seriespkdy,l7- .xea circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circu.ne0qb2vrc ra 1ka 5nnk2gs9 7it is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuitz q;,lfgqvqts:f;g6 is(f j ;0 increases if R increases.v:;gz s jsq0;i (6;lqgff,qtf When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the mcft84;8u:ha )fjs n icircuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance 818 osf7cjbyr 2xxa9 79ymfwa of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC ;;xlpo v1yxl ,7e x2cqp n)jz5series circuit, the reso ceqpj2x p ,z v5n)7yllo;;xx1nant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltagehf v8)-ilm f448s pehj. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC cirb el3m50v o8wmcuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform *k7f r;ml 9)0vxj5gkv4m cuzcmagnetic field of 0.20 T. Find the magnetic flux through the loop when vmv4 u7*zr) gkm5 c0j x;9fcklthe plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fie(ak a0o4m3- msatwk +my(lxr7 ld of 0.20 T. Find the magnetic flux through 0talw7 kksa-xmo mm 3a(y+r4(the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mcgq ups /970exagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an su7 pcg9x/eq0angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional are:;d8g mrqojh9zv vu)l 3p r*e6a of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fromw ezhv /mv0*4gbce )lz/ 3n/q3-bo vsm $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sm ;pu lb: fa36(zp/axyn9wxey55cm 7q ides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average(cwufa; 5 xamyb:69pzqn x7 53/e mylp value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 tura,p1mbbn 2.2 bin)h ojns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area6xtr j52tgp9c fe(2go $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontaly 8d,adb eich*c (+oj .x,9evwly at a location where the downward component of the Earth's magneticoiybd*v,jc dhe, w8(c+a 9.x e field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at ab 4si6-bc k)wwl)iqm; hs* e:z constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constankbi4 wsc*:;zh-)blwqi) es6 mt magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loogo1uj6w xn, ai7z+dqf1s mi7l w+26brps and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 e,t :* dnqswe,turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its arq.fqw -kc 1ui/mature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform mag/fkuq .c qi1-wnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists62 x/awf4 azwt of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator so, e/ qed/ lvnl2z:;dky41jjwith an output of 12 V maximum when rotated at 60 Hz. A ml,;jo21yez dvl: dk/ /e4qnsjagnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wil t.4:sqofnp 5th a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motore skk6e tmmx*7,pos/0 operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of *3nc-ace 7eq -a0gnct t ij3)5 in +2njnyk4zb6.00 W. The motor operates on 120 V AC 7kizynn+) 0tn*5g4t en ja e3icaccn3--2jbq, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance q6uhtkj9 nzhmv)nw fg02.3 3z6.0 W is connected to a 24-V power supply. The operating tknh whzgmu6f33)v 9jn0z. 2qcurrent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resi7y(*z ccq9oxza s97 nnstance 6.0 W is connected to a 24-V power supply. The operating current is 1.0q nz9axcc7y(zn 7s 9o* A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to afyi)w hnyoz;pl qd +*6db ;7ol2.lx*c 24-V power supply. The operating current is 1.0 A at full speed.h cnoowq7*;i+ l)pd zdyf l.*2;6xylb What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary volkip x) u68s .rbko32chtage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow *dfzuq (:h- e6ous(epin the secondary. How many turns are ineudu * (fsq6ope z:h(- the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 4oe ;f*vxnco) 110-V primary if the 24-V secondary *;nv4o cexfo)has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn pzw3xn8b(2:w57pt*db lu j ,zpf crbr;rimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primabnfuc*8d(75t32z bjz: prwb lp;w ,rxry?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in theh7g j7qdx h1-1 ue1/32dtvbzff+stv v primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the gd/1h27fetqs uz h+vt 1v3jx7 b f1d-vsecondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10/a,isnv*2evihndd eg -8m:-q .0 mA. The primary coil operates on 8*2- andheq:-dsvii/em, vgn 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns s,biib )v 95yal k-3kaon its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whks)a v ,yi9k3ial 5-bbat voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coilcik z99*dx5ehlne 5h6 and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curre h569x k* zcenei9l5hdnt is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a tran9b;x+zni*7kn hi/2 ;tx wgxqdsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 1;* k/ixnbdtxghz iq;n x927+w00 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns g7az 2*,igfgs1g dzu1o3ud/lqezo5 /and its secondary has 200 turns. If the inp7,/d ozqao zgu fug32se /51d*z1ilggut voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has h+d1e.jpkprra3x +s09 n d tq5100 turns and its secondary has 200 turns. If the power input to the primary ispd9hjrr51 pstn +d3.ax+e 0qk 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The wt :rto-cnntj 76+b8v voltage is usually stepped up to 4500 V by a tranw:j tt nno786+-trbcvsformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage isu:usgsl 7 , y(gc.ikx8 usually stepped up to 4500 V by a transformer and trani78x (s :u.cygg kul,ssmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually st,sot hua/q8elb( h. xlf-4g-kogd-; gepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost4hq-bggox-o.-g stld fl h;8auk(, /e in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km lon21/ jiuvo .b,uh1a*jah+ i gdcg has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would da ii2oj1v,bchuugh+1*.ja / be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of nvkf4di0k;wk2j- 1ce 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when;kkvd1 2j4ciw ke0-n f the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line k44o-nu 0r4cuxbz/ xw at 1000 V. How much less power would be lost if the power we4-nuzrkx4 0o b cx4uw/re transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It iojn j1y )e7vgig(o8w .s to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to eo7i)w gj8(1vy.gn ejoxceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 Arn zit3rva3 c3(9yfw ,. How much energy is stored in the coil's ma ,3n(yz 3iarv9ft 3rwcgnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6. (x opj/n5j2pl0-W resistor and an 18-H inductor. What is this circuit's time/pl(jn5 o 2xpj constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage i3pz(h;i5fjb. cp5la8 swo :o xs 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed intoxh n() tx8rw1o a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the k.9i*ir4vpk aresistance of the lap k9 r*k4.viaimp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to3o b.y :n;lnuo0l 20 lmyjxwy f/3rp;:mxrh)o a 120-V ac power supply. What is the peak current l ;)l yo m y2/xo:hlmo3ujw.nxfrn03pb ;0ry:through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the powec:i 9t 5fij1q9g qdtj+r dissipated in the rqdc9g t 15qit9j+j:fiesistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through ab5 gn3ta:v;sd+b2dc4ku xag- 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-25+sv 8okz.mp9y qvms4icozv d, 4e;hW resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rezyw q9oiu+ 58psistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH in gw/.e 8agkw-gductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of9o4j;.qlrr+ef -iags+f* ek e a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive rhnxapy2d fq: / wndqi)(1+t p:eactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactm) .yd)a7cs.dhbuaa/(fx3j6j o d ,dv,ufn5q ance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor whe8v2tm/4 i tf):bu,)oilb fos ln 120 V AC at a frequency of 20 kHz is af ostf 4mi/)ltb, ob8u:2iv l)pplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil s3 .x(xyhxv7fdue to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactan.azvs,xu(mfuq ntk ,,wxr 8/ 9ce of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed iokfjw.vm6elq59jin 6 2hh.0 to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have3qw.gk ba6xv5 a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance onpb+jjq.9l ( ;ew)i obbgn-k8f a 0.010-mF capacitor be 100 Wkqe blbj.89+)p;nobnj(iwg -?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz53o hy(d* z0woz 7q; ewcol3db and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circui(ao7 dis,*sa.w m6dfgt with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive6w7*g.osmaadf (is d, reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at /cgrnhm0 vr7p1z .k,k1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacit71vp rczg0mnk/r ,k.h or are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle ath 2 3k ,56eoelw 8o qi2osd/n5kbopoi) 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecdw opo8o/eiehn koi5b,)2q3s65l2okted in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH g,q d.;,k ntilg0lt;p+xp-owinductor, what is the impedance-0d wtn;,+l,iqp kt.og xgp l; at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series witmtu 2 led)fz +5z6y 90hy(nqmlh a 20-mH inductor, what is the phase angle at(2l uhl6zn5mq)y0m+ dfztey9 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit no-4 45ijmdq4dn), ez rfil*j with a 20-mH coil and 1.0-mF capacitor for a tota)rfl4-en5,4jo j dzqd 4ii mn*l impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in spmkmay :s/r: 8eries with a 100-W resistor and 15-m8mrp/k:s:a y mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 H neufj.;k smgc(+ 3z.ez for a total impek+n.zs fg(em.cj3 ue ;dance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in mo2hs /zlcc2ju8b1+ai da4 f -series with a 100-kW resistor at 1.0-MHz for a total impedance of 1mc s acjb8uz24adl1/i +o-f2 h50 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is thu2xsm*z1mn 1af-9 wybn:u hd4e impedance-mm s:2z1u xbnu*nf 49 1hdywa at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF caovvh )noe- pwdkpv5vk )9fl z5(0/v7 ipacitor at 1.0 kHz for a total impedanlw(ippo-e9v h75o)n)vvk5k 0dz /vvfce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cepa 0e j+nl:svo :* t+qa;gnqrtd: ;3wapacitor at 1.0 kHz for a phase g te q:w jno;a+3nprd0+tleq :sa *;v:angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in q s+fff4nlp25a i5-tm series with a 30-W resistor at 1.0 kHz for a total impedance of 45 Wf2-s tf fnpa4ml5i +5q?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hzd du5xai7 b6.q. What is the phase u5qxaib 7 d.6dangle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at yt. zq-ud0ykin(f1 ,o5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ,0tdiy qn1y. (zf uk-oin series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacit0 z+ kzqp+gdj5or, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currezz+k+q 0g djp5nt in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductorarcurkp/9wv) -a *m t9 of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. k/maaw u)9*9p crvt- rWhat current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a u 8smxb,rdy* 750-W resistor, a 10-mF capacitor, and a 0.45-H inys b8md7x u,*rductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for fo 0 *2j(3t(5jgpqcl/ckfhtq/ ;s ogakk o.y2 a phase angle o3f . cy2/*(gq/f shl(0tokj2a 5 go;ktpjcqokf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At9 j3ewgw 9xl;3gw uec, what frequency should the circuit be d9cgw9xe;uwewj gl ,33 riven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit l*0vm+by qa1teh*+k cbg;) qpyh tv5*with 12.0 W resistance, 15.0 W inductive r lt+ ;b)pgy1kthqhvb*c *yqev+5m* 0aeactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an ACn,-h-xv0 hg-av/cp nn circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impe.vyiv 7z4++;ewgn d gmj:f.u bee6r8ddance of 60 W and a resistance of 30 W. What is thev b .vnr+duyf4e7:gj.md+zw86i; g ee power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC -, g fn wu)7z qv;*jh*m6zwje0z)sqsxcircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz;7fq*hj6zwzv, *- 0nug xswm ))jzqes power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant freqnmia1dqbq x uo,3n 1*+uency of a 1.0-mF capacitor and a 15-mH coil in series?n db qn1,amo *+3xu1qi

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-m/n6+cjc ha7gco kwi u8he/35 dF capacitor for a resonant frequency5h 3 icu hkcd6nega7j+wo/8c/ of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resona /u ofioqv: x; t(jo2xbs)fq./nt frequouotv j; . 2/sbf)fxx:iqqo (/ency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed .em au7dox)u 7to505aizr e.d in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz? a ut7iodzx)o5 .mee7.5daru0

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