09.18: A wire has a conventional current I di 7h/8e q)epr4v/eo vomrected to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic hm/74eepo/) v evr8oqforce on the electron at this instant is

  14.24: For the bar magnet shown in the figureb)f:mt6 x;+wlyyzw (j , which choice best describes the direction of the magnetic field at the point P located directt 6)m:lbwyjx+ yz( ;wfly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional cur nyr auxw.w(:o) lp3a/rent I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward th)plr o(uxa3.w w/:nay e wire?

  13.30: Electrons flow to the left in a wire as shown. For tei.2o6/hpbj 71j edj uhe proton moving toward the top of the page at the instant shown, what is the direction of thep16u /io jj.e jed27bh magnetic force on the proton?

  94.30: The conventional current I in a long straight w/ut s(y/4g7 q p7*x ejwr2na.yd6 ysavire flows in the upward direction as shown w*/4. y 7uqn/yv6 ss2 aejyar(x7pdgtin 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 proton is:

  95.16: A charged particle with consba nirfe4+2hqf0e )a1tant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle wnb0+2a frehf 1q )4aeiill:

  98.10: A charged particle with constant velocity d28v/rvq m*-qp1tf aplom c1k+2 j9lggmf-6 kenters a uniform magnetic field whose direction is parallel to the particl1 j+* ldm8/f 2qkgtpl2 v6-a1gkqofrpc m-m 9ve’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a ew d(ov+. l ewp8 b8nwnm75(ecvb)o)utable. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field nwp)b5w(uo.eev8ovbw clde7)m( n8+B is directed out of the plane of the table. What is true about the magnitude 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 velocity in a region ozlr aj.o0v :t5fxhg)6f space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of the page. What is the direction of the electl65o0z ft.ga:rxh )jvric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible we8i -6s3natbuaight is released from rest between the poles of a 83uab- 6tians 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 ph v+z95 j0fyn5hixis-mz3d: iage at an angle of 300 to the horizontal enters 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 describesi fiy:x09d- v3ih hzn5jmzs 5+ the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with spei*z geeir)o; /zx)v ;yj6h5lv ed $1.00× 10^3\: m/s$ 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 is 0yw3k :i+amm) ddrk5(;u aytravels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. Iy : 50 y+aid)ur 3;wm(dsaikmkn a time t, 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 magnetic field6qer-jkqtq555u rj07bwso4 o B and is deflected into a path with a radius of curvatuqq57tw4j r5s6 rq jok-o eu0b5re R. If a second 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 circular orbitw2 f0cu .6esuu 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 during its motion, what is the ratio of the speed of the heliu2fuu e cw6u.s0m to the speed of the proton?

  10.43: Two ions travel perpendb fqri.ory672 icular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities mo yb.fr 7q2ri6ust be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a region of s 2mq:1l,albzmg rq0m/ pace 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 gzl2,r1/l0am qqbmm :constant velocity?

  96.40: A proton of mass M andc,bvil sd (kc ytq/h/kk::7mr;;j 8c m kinetic 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 is commonly dete jhc ,l8j2gxy/2mlbr*4n9 p eo .b 21fu1sxxmprmined bx 211m*pm9l,j 4lghyb2 s 2e.rxcpn obxj/8ufy

  09.27: A proton moves straight up the plane of thisyjn 7yq80z 41t *:m ouf;r;pivhsls*w page into a region that has a magnetic field directed to the right. If the particle is undeflected o8;vw7sl: 1 y t urhi;*fqsj0 p4nz*ymas 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 plane of the page through two regions of i8h 0s mwo2(sx+q qj,ispace along the dotted-line trajectory shown in the figure. There is a uniform electric field in8w(2,xoi0q sm+ hiqj s 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 a req58 1yt 2qpncngion of space containiq1t 5n nqc8y2png both an
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 lj lwwk)e:fs2l05v 6 aconstant non-zero velocity directly 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 dife 6w0 sll)v: wkj2a5lrection of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.