09.18: A wire has a conventional current I directed to the right. At t r8 4mr; ,)ezf45yvl92d.xb9+kw rq bvmtefxehe instant shown in the figure, an electron has mr)bmfeftxzy 5v drb.8kvl;q2e9w4 49e r+,x a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figu,igu23ht03us9prpu xm/ ,n yz re, which choice best describes the direction of the magnetic field at the point P located directly above the center of tht9i3hyp ,up, xn0ur2 smu3/zge magnet?

  11.34: A wire lies in thelx,r6.ovm 7i d plane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving dirr vdlo.6,xi7 mectly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton mtzcy3 iz0: (thoving toward the top of the page at the instant shown, what is the direction of the magnetic force on the protonc:t y03(ihzzt ?

  94.30: The conventional current I in a long straight wire flows in thm-:1 . f, 7,pw kduuq(pfnsw(vknuqr9e upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire and heading directly toward it, the force on the pro nmwqknv : (,q,wprfu7f. us1(-du9p kton is:

  95.16: A charged particle k kkdtg2z7 w425 byjm.with constant speed enters a uniform magnetic field whose direction is perpendicular to the particyk.d5gzjb7 w 24k2 mktle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic fv4 w,wpm(j.tb*k+ftb ield whose direction is pakj4fpt+m *,wtbv( .bw rallel to the particle’s velocity. The particle will

  03.34: A positively charged particle te iv y3)jx5z-of mass M is at rest on a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of the plane of the table. What is true about the z 5xjeyi)tv -3magnitude of the electric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero vext/e f5 1 /qob d;v9x*o-wstsqlocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up b xe*sot/x vs-wqfo9tq 5;1/dthe plane of the page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight i5 4y e3qrc.zbvs released from rest between thee r3.qbyz5 cv4 poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 3p-g qe:x )+ qbk fbf.)wkp l0ch3w:mg)00 to the horizontal enterqm +)-:lgxbk 0)p )b:wpghe qwff.k3cs a region with a constant magnetic field directed horizontally in the plane of the page as shown. At the instant that the electron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with speed dx0u6 a1wcj3: wn 0muvec;p97 ;pybwr$1.00× 10^3\: m/s$ as it enters a region of space that has only a uniform magnetic field. The electron is accelerated because of this field with a constant magnitude of $8.00× 10^5\: m/s^2$ for the entire time of $1.00× 10^{−3}s $ that it is in the field. With what speed would the electron exit the field? Ignore gravity.

  14.29 An electron with charge −e and mass m trfsmj0*cz* a 7eavels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, j7f z a0*ecms*the electron travels halfway around the circle. What is the amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magpo* ycd z* 3*xpedl7 g6coac58netic field B and is deflected into a path with a radius of curvature R. If a sd 5c ca dc76og8z3 *xpelpy**oecond ion has speed 2v, while m, q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a 7.b kk+d.iy yecircular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic force b yk. idk7e+y.during its motion, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same unifr9 2chy-d zbadz/7j6horm magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the sameyd 2dbjarzh96c 7z /h- for the two ions?

  02.15: A positively charge 0o5jm gclg,x-v5 /am zft;sh,d particle moves to the right. It enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction does a magnetic field have to point in this region so that the particle maintains a c/a ,g0 jz -lfh g,vto;5ms5mxconstant velocity?

  96.40: A proton of mass M and kiadex 5gmz14.a netic energy $E_k$ passes undeflected through a region with electric
and magnetic fields perpendicular to each other. The electric field has magnitude E. The magnitude
of the magnetic field B is:

  04.25: The speed of electrically charged beta particles ir/iblm; 8dg0jkh3 d *s)p*f sss commonly determined b hs8)*r s;gdb*p lij0msfd3k/y

  09.27: A proton moves straight up the plane of this page into a region mt,- ay v:*nke7-p3fjpe0iyz wo 5t )gthat has a magnetic field directed to the right. If the particle is undefl7 j -i3f0yk5pp*owe :t z-ma)tvyge,nected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the planen q;*p 6phj;n/ enzpi5 of the page through two regions of space along the dotted-; z ppiqhpje5 6/*n;nnline trajectory shown in the figure. There is a uniform electric field in Region I directed into the plane of the page (as shown). There is no electric field in Region II. What is a necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through 5v;jfgbqk:,i a region of space containing both an5 bqjv k,;f:gi
electric field and a magnetic field. The electric field is directed out of the plane of the page.
Ignoring any gravitational field, which one of the following choices represents possible directions
of both the particle’s velocity and the total magnetic field in the region of space?

  15.29: An electron moves at constant non-zero velocity direcm-qiv 7rk:b 2dtly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite directions as shown in the figure. Ignoring gravity, which choice best reflects the direction of the magnetic field and the direction of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen ext-rqi km2: 7dvbernal source.