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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 uni;, pqn/qcrmwmq2c/im d 29qg(ts of magnetic 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 indz 2gmtfm0l*: juction states that the $emf$ 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+dic 3mkt(in(y1u , vp in a coil produces what kind of change on the induc yc,1t pv (num+dk3(iied $emf$, 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 magnetic field through a loop of 4 fw1sg xcvv bu61twt-/+ss p(wire produces what kind ofb1t g+1xvt6p-vsu ww/4(sf c s 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 lodv8i6xuxc kp3 jo755 dop of wire produces what kind of change on the induceddxucjv8k7o ix 63d p55 $emf$, 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 fl fjf93hn; op -xxw,fwj93wr8dx,6vmield 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 induced c a4lejkf s5w26o*bbi/urrent in a conductor will be that whwoe*b k5 a2b js/fli64ich tends to produce 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 fla9kx hhxxjhej 90+0dri/l12canen, 8et on a horizontal table. A bar magnet is held above its center with its norx+a0k8x2,rnd9l /e 09nc 1ee jhihxhjth pole pointing down. The stationary magnet induces (when 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 flat on a horizontal table. A bard;p m5, 4 59q buoliv1uilg5tr magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falpu95 bt1r4,lodgqi m ilu55v;ling 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 in a region where the magnetic field vecto-d (biy japq4godc ,03r points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense ofbdoj iag(c, yq0 34-dp 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 rn ofb9n/gjwoz6 q0n0mp*wi ,.egion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced pogojnw z.6,/ mbn nfqi900w *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 table top in a region .cq 0p(s3dpc5ty c vxx09ndj; where the magnetic field points straight down. The magnetic field disappears suddenly. 9xjq3 (txp;c0cn dycvp0sd 5. When viewed from above, 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 oa6 vos o(s:*khn a horizontal 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 ha* k6ov:(oss current 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 through a loop of y7wc /yo 0m9fzrzz fe+m ;3(jcn6.usywire with the north pole entering first. As the north pole enters the wire, the induced ejnfymz/(scc9z3y+ o;fzu7y0rw6m .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 rotated at constant angular speed a.j 27wscul0rxk/ hl n4u1:w okbout an axis whose direction can be varied. In a region where a uniform mc:x0 74rk w1 suuohl.nw2l kj/agnetic 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 ang:o8o,b6url v*z cg)qlular speed about an axis whose directi)b:ulq*z l,gov6 o8c ron can be varied. In a region where a uniform magnetic field points straight down, what 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.9y9-*:rqxpuzh zu) v 9d7iwhf
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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 t ut eoixqwn1n/4+-9w jhat an $emf$ 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 fieldyzq 9m e6.voy-. The $emf$ 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 co)t (z ed+mcip3c6n5east-west direction) is moved northward at constant velocity through a magnetic field thdn t5+cp3czm oic(6) eat points 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 rotb.viz1 *(w b,le 5jqrkates 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 tr *btuj d*t60zczg+ iu7ansforms

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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 frequency krb/vec v h 6x8..snbl 4cy*5tof thhb/86 v4kesrt b.* xcn.cl y5ve $emf$ 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 deulzc:97 b. lgpve:q6 t;hp:qovice 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 devicxn kv 86 bt;au4 xj),2bupdfj+de,0z xmx8ei;e that

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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 contkj+7tdfh vs998 nv a2iq7z3scmje :n3ains more loops than the primary coil then it z2e j 3j + nc73m vsifvns9:9hktd78aqis 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 c .yyce4 x:68 nfiiwue+6k0mbr) x*i ewoil contains more loops than the secondary coil th. nwci6 6b kee:wyfi x84ireyumx*)0+en it 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 power inx gd9nqg vq19*0:jer qput

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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 circ )x2j)ziq(t3zz 3ud+b0i bhopuit,

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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 batt6qk u xdqk6j k0)ui5q.ery of constant terminal voltage. At the moment condk kj06u5k 6iuq).xq qtact is made with the battery, the voltage across 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 serie/ :,a vgarh 91cwt2anss to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across, awhnva st2:a/g9c1r 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 inductancm. bncd,heus vii27b,qx0*2e e 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 inavu1+ddh o2q6zz 8e9 t8z n4lhductance 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 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 inda mtu(,skd ughlq2lkv1+22s xz( +l0tuctor are connected in series to a battery. The time constantalkg l1 u+ tvhtx 2((lmk0dzssq,2+ u2 for the circuit represents the time required for 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 inductomzs up3gt1e )2r are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time rgp zmu2e1st)3equired for the current 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 samejc* xoym,ozat i4i+in t).2b ( 5a,ati 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 cuilbk fi2 a)22p+c.umu rrent

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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 )wti67bq:lx)cqt7 kg curren6w i)7 7lt:txkqcb) qgt

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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 cl0n4;g1v l nleircuit changes by what factor when the frequency is t1vlnln;l04 eg ripled?

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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 an indu/md.+ pufg/va ctor is doubled, the inductive reactance of that inductorm. pd/u+f/a gv

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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 v 5fynarvb+-i.oltage across an inductor approaches zero, the inductive r ybvr 5+i.fn-aeactance 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,2y9l;djn,wryty 7 dq) the curren,rw7dt qdyj92)y yl; nt

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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 ac cirhcc8ful3+i u3+zxl -bv3y.shcuit changes by what factor when the frequency is tzlib y3sh+ -83cu3+fluhc.vx ripled?

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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 the AC voltage across a capacitop 8t8)txxw4bz r approaches zero, the capacitive reactance of 4)tx8xb w8tpzthat 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 olqxvzsakl f8c65syos 87,g+, f the inductor and capacitor in a RLC series s78 k+fzy6 5o al vgs,8sx,lcqcircuit?

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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 circuit is defined ax -ma7fjdyrw5a 3aq+zi:; bu8 s $\cos M = R/Z$, 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 circuit d) 1q;j8 amy0gquab9t9nkv/c increases if R increases. When is this statec jn0v d9/9yau q;tb8kq1mga)ment 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 impedan5:agw6 ; :r -lqkz8lf xkvnul0ce of the circuit 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 of the circuit increas y5oke2s(fu /zo0w/7miwy dw 9es 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 series circuit,b9hu;t obm+86i9m 9 ick(zh ow the resonan tiim98czbwhuok+mo6 9; 9(hbt 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 voltage7pdqly*eu(cxcbvno0 i + - -(a. 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 circt5lbd.xdxn*7sah9 , f+(li t1de : qkxuit 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 magnetic field2xtksy lc xt-4+xi7 s8 of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are para-4y7tx sxl2c+ 8kxit sllel.

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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 field ozf -ailu5rq:ho- 83h8-kqqa vf 0.20 T. Find the 53:u qlo kah i qz8a8fhqr--v-magnetic flux through 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 ijs:ir me )c0j/n a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane 0:j /sjcrim) eof the loop and the magnetic field vector are at an angle 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 area of an adjustablel8 sam9wur52 a l9uqe8 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 chanbs6s(xbn 8s q:r26iy:irx )ex ges from $4.0 \times 10^{-5} \; Wb$ 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 sides 18 cm. z5)u;c a fhgbu2s*zk(m y3:vh 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 value o:3 bz)acuhkm (s2*gzu5;yfhv f 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 turp xlgn0bha0 4(ns 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 arntou4;i0.1 g fcp4c ag s:nn+iea $0.20 \; m^{2}$ 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 horizot+2jjjn 3hba+pg..- :nj 8zvnz*k runntally at a location where the downward componen t:p gz3jj.h2++nz.unk*rjjn av-b8nt of the Earth's magnetic 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 a constanv7 wcwxou6 v29t angular velocity of 2.0 rad/s about a vertical axis through one of i9wx7uwv 6o v2cts ends while in a constant 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 loops and a cross-sectionaqyhv7vavm83k: / xpn( l 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 consd8 cs 9 yas2e3ojp41bv tj1c7iists 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 $emf$.

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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 loom;a 8khta0 vt8ke2)qel3v)og ps on its armature. 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 magnetic field of 0.30 T, which is perpendicular to) 83t)vea0vk hl ga ;2qet8omk 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 consists of 100 turns of wire of 50px 5llj64jfujo ( qwpk42up 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 sinh3 w-+ ;.zpfe(z k8 e+jamkiymple AC generator with an output of 12 V maximum when rotated at 60 H-a(ekhk3zf y jz;we++pin. m8 z. A magnetic 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 genera u*tvp;w3j6/gz ,q0pnuhj w: itor with 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 re116q qc 38 u ftxmq2dhm/j6qwtsistance of 6.00 W. The motor 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 moubz0-w7 l6bgntor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed 7w60nzg -ubbl 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 6.0 W is connected to a 24-V power suppl ea p*c l0jwhz0x0g4 /mjsh5/hy. The operating current is 1.0 A. Wh z4mw hh//pjgcs 5ex*00h ajl0at 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 resistance 6.0 W is connected to a 24-V pnk 0+7dmz r;pcl8v2r dower supply. The k dclmv; zn7r0d+2p8roperating current is 1.0 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 t ro:v2blhtc9) )zka9jo a 24-V power supply. The operating current is 1.0 A at full speedk92b c:aotzr)hvjl) 9. 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 ao 2ef.c owdc(yf *+/nl primary voltage 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 in the sect cm) *t-4ce o19 lf)zmkqch2rondary. How many turns aoetczk t1ml-cr4q )m 9)2c f*hre in 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 110-V ptm4ztym46q,m o e m89primary if the 24-V secondart m69e4 qzmt48 o,mpmyy 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 primary coil and a 2000-turn secondarqh qnx)e4 n z7y-/3vtyy coil. If 7x-) qev y n4tzhy3/nqthe current in the secondary is 3.0 A, what is the current in the primary?

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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 the primary p*m :b; 9pruqeof a transformer. Assuming 100% efficiency, how many amps at 24 V can flow i*:pp9 ; ubrmqen the secondary?

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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 7l rzld/;nsm 94500 V at 10.0 mA. The primary coil operates on 120 V. What does the pri9sldnlz;mr / 4mary 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 on its primary r7blsa,78tgh coil and 300 turns on its secondary coil. If 120 V at 2hr8,bgat7 s7l.0 A is applied to the primary, what 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 coiw(8noat / ltm elb,)/dl and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cu/ /l me(tld)tnw oba8,rrent 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 transformer has 100 tnh / ssl vda7y ig0+4aw(87yqbhx* x/gurns and its secondary has 200 turns. If the input current at the primary is 100 A, w7ahg*yny7b /x/l0 ( h4qswsgdvi8x a+e 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 and its secondary has 200 tu/ 5c1h yf8qsfhrns. If the input voltage 1hhfqc/ s8fy5to 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 100 turns and its secondary haqm1 /tn3 f*o9gr +qnnls 200 turns. If the power input to the primary is 100 W, we can expect the pof+ 9 o/lm 1q3tgnnq*rnwer 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 voltage is usually steppedte- fe,his)4tg),b,dfk7 i,o)zkje y up to 4500 V by a transformer and transmitted throohbs)4)ey)- ,z f ,7,je,ti kkdfgiteugh 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 volta1hpjep(a *jg-ge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power losj-pp 1 jhea(g*t 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 currentr 2smo6ne)qq1 at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find thqs6 n2erq1)m oe percentage power lost 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 long haszoh,jn yd4.aea:bnz/ .t v(g8 a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce en, 8a.:4(jeonh /.z dtzbaygvnergy 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 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 hahnx l*8e(qzs-6x; niw s a total resistance of 0.60 W. A generato*nh ;neqx-8 z6ix (lswr 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 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 at 1000 V. How much less power wtu ,0cygg* f+would be lost if the power were transmitted at 3000 V instead of at ,*wgug0tf c+y 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 is to be transmittedj,j4actm k*gp6 5pl* vw yvw89 on a line with resistance of 0.60 W. To what gjcj4m5wkpav, 8wl6*y pt*9 vvoltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 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 A. How much energy is st8qekh( -1nbcv ored in the coil's-(e n1qhbc8 vk magnetic 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 6.0-W resistor and an 18-H inductor. What is th dtea * e/1a:)ghirom.isaaeg):d/mie. 1 r* hot circuit's time 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 theq6bs v d4qvf+: w27k5h,yx twa rms voltage is 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 into a 120-V AC outlet. What is thd+88tqzntac5b3 ro 6t3sk/xm llgy 2 9klpx3:e 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 5ay9xrv;l9bwx dn (x *120-V AC outlet. What is the resistance of the lampxr (yv9x;xad9wb 5l* n?

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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 to a 120-V ac powe vl6evw7ga02 pr supply. What is the peak current through tv ae2p60wl7 gvhe 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 pbsjdcxy):;qkcs 3g) ,7h7d czower dissipated in cd)jq7, )y:h73cd ;k gsz sxcbthe resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5-:kg nkw:6 qofub z1czh0 6fy9-k/dzk0-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-Wjyth8htd d - i93:cbz1 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 reso60u.hcbvyg ln3/ s1ristor 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 inductor at 60 Hzeq rde-0xe 27g2v qen f17jis9?

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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 of a 2.50-mH coil96vx fdm+k 21zc ugtnael (a/2 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+e+ry *s6qqhqka 2, sn W of inductive reactance?

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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 reactance at 1000 gvq7d a+xo +pc8p*+csyxhi:hv* v9 *iHz?

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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 when 120 V AC at a frequency of 20or)o*2rauu 3qu j4i*p+ cxe8e kHz is appliexe4ooc8eiup3qa2) u **u j+rr d 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 throug9xp8egn/g6 n mm7s(ig5pz mk +h a 2.50-mH coil due 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 reactance of a 4.7-mF capacitor at 10 kH-xlhj,a:th 0fn l*0i rz?

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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 to have 50 W of capacitive reactancej 4*qu 2dti0rf 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 do j /szs pgmj bdb91)8a8:(icmses a 10-mF capacitor have 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 tz 7 6dwwmu)(cgndx6d-os4 e) mhe capacitive reactance of a 0.010-mF capacitor be 100 W6m7d udn46w-mewd(zs x)o) gc?

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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 aks8 8 zswuux),e /0cdd 0.0010-mF capacitor at 1000 Hz 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 c3l ov 99 nreb/wyqd/q(ircuit with 12.0 W resistance, 15.0 W inductive reactance, andb o93y9/ eqqwlvnr (d/ 10.0 W capacitive 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 1500 Hz if a 100-W resistor, 20-mH coil1 5 l2*lxzofc x,njpo2 w qcwu2v;25pm, and 1.0-mF capacitor are connected in serij n21opcuvq2mo5;f pww5x l*c ,xlz22 es?

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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 at 1500 Hz if a 100-W resistor, 25up 8 rz5;go cdhod80b0-mH coil, and 1.0-mF capacitor a55hzr 8odd ogp08b u;cre connected 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 connect-vv fq6ypss */ha q5o :jyg+*ted in series with a 20-mH inductor, what is the impedance ata*og *+ f:j- sqv syv5q/y6pth 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 inl i9t d4a9qjyz ;i0e:z series with a 20-mH inductor, what is the p4zt i:iqj0a;99zd e ylhase angle at 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 with a 20-mH coil and 1.0-m4h.r sc6a 8u+nt,syu u/a+djnF capacitor for a total imnrj4su/s,a.uu dnath y6 8++ cpedance 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 followingi,0u9 slqhf nzmwb* :6os1ow 6 capacitances is needed in series with a 100-W resistor and 15-mH coil to get a tota:1w 6qbowsnz* hlo fui 906s,ml 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 pl33 7dsq/. cv,lffqtb ut in series with a 450-mH inductor at 5000 Hz for a total impedance of 40q/l3fbdc svq3l,f7 t. 000 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 series with a 100-kW resz ;+i; bzo 9)5a.ke*o irjdvqtu1t9*gx qmnm(istor at 1.0-MHz for a total impedan;m.t t+b q )i; *kzmq(r*9an1dooz j5xv9iguece of 150 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 i.,x ip-ewfr m1s the impedance fw1,im .p-re xat 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 serie5;uhaj-)gq gborrnt+y ;k;3r s with a 10-mF capacitor at 1.0 kHz for a total impedance o;)rjb3 n;trkg+ra-h oq;g5 yuf 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 capacitor l0anpjsy 9;)m63cyok at 1.0 kHz for a phase angle of ;j n36skp0y9l )o aycm$40^{\circ}$?

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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 series with a 30-W rescve njn (k/9mb e: oz0-bmr*b7istor at 1.0 kHz for a total impedance of 4je: r vne0b *obk9(bnm-zm7c/5 W?

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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 izsn/w-ffkby /wrn ,;;n series with a 100-mF capacitor at 120 Hz. What is the phase angs- ,/rynfnwzf w;;/kble?

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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 5.0 V and 1500 Hz if a 100-W resistor, 20-mH ; hjz l yl 6qc p.9s-ouoiip7kw35d,1acoil, and 1.0-mF capacitor are connected in6,1 oi ijo;qucy.zpslwh k 3d-7p9al5 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 capacitor, and -v f1yc3;q4ttrncfnh5 x: fj,k ox (r0a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. x(5r1jno0: t tyn4kfhq,vccrxf;f- 3 What is the rms current 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 re6fy/h(dpz *ly actance 30 W, and an inductor of inductive yf dly z*/6p(hreactance 30 W are connected in series to a 110-V, 60-Hz power source. What 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(i2 2sww zbs9+gty/ouz1psey55 8r8 xt ti,ep series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-+ t2pby8i95zuw5(w/t 8 sezsgtore1p2, xyi sHz 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 seriesoqw( 6k1jmjf/x9+ujbe o,b* s with a 500-W resistor for a phase angle ofuj1oj(+qb9e6jw bfkm x/o* s, $40^{\circ}$ 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 qeq:qfhr;j2- , L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivij:eq2 - q;hfrqng 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 outp j:**2k5*g colyxf,1pmnpczwut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit 1*xojfym np*k5 :zp, glcw2*c 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 AC cir mi50+ qms sq6og,q.lhcuit 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 impedance of 60 W and a resistance of 3+o mkgtcw )tjj; dn b:ebx6:)2fdvy1;0 W. What is the power factoe)2)b wgbt;j:tcv1o:fdk n y+xjm; 6dr?

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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 wrnto qfpqlau b1(ir*e;y: 72e/w ;s, circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H induqibtafsypleq;r o1 , wnu*wr;:2 7 e(/ctor, when connected to a 60-Hz 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 freyc:dsf vx z;,v8o a /*lpwu;z(quency of a 1.0-mF capacitor and a 15-mH coil in series?uc p,y/:(a8zfvxzdl;v s*ow ;

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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-mF capacitd(svs:e2v1 gcor for a resonant frequency of 1egv( c2sd:vs 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 wqec( mp .y t8+uqp7j:zg;ymd, ith a 3.7-mH inductor for a resonant frequg jp,8 m7ypqm;zet q(:yd c+.uency 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 in series with a 30-W resis(;s vgcf r-c*otor and a 40-mH coil if the resonant frequency of the circuit is to (ogvf *- ;rcscbe 1000 Hz?

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