09.18: A wire has a conventional curro-wbl zk04-ekw(po 1yent I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. -kol wz1b(kwo40 epy- The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in t9te(jt2xhz o6he figure, which choice best describes the direction of the magnetic field at the point P located directly above the center of the t2(thex9o6 jz magnet?

  11.34: A wire lies in the plane of the page with nc) .wcl bx5b7conventional current I shown. At the il)5w.c7bbc nx nstant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the lef1uzbz 3 -pfs/qt in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the dis 1u-fzb/ zp3qrection of the magnetic force on the proton?

  94.30: The conventional current I in a long+ h )y)q;frqc.mlth4r straight wire flows in the 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 torth)+. qc4yr;l hqmf) ward it, the force on the proton is:

  95.16: A charged particle with constant(4ry1 u n0zes5)zdfbyx4;ggo speed enters a uniform magnetic field whose direction is perpendicuz0 1bgxu (fn;sreygd)y5z44olar to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic field7i w z*-.4cbl 7f aik8geucs1d whose direction is paralcz4d .f-e7l* bigiwua178skclel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table.h(qswprd5hfd d *u2)0 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.d hdp(f )h5r u0q*wsd2 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 s c2-2st)nj gf 8u,p3zp 2esdta region of 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 then2s -pftucgesj,)s 2t 8d32zp direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from rest mivtyv 42 p, wfwj4)l)ewau5fzr 9g(5between the poles of a horseshoe magnet as shown. What would be the direction of the acce)afe fpml(t594w,4i5z v rwjvgyu2w)leration of the charge caused by the magnetic field?

  10.26: An electron moving in the plan+hzo / pkx ac8.zt*li:e of the page 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, whichp:zk8ox */h aiz+lt. c best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves woi37mo 8boj-nith speed $1.00× 10^3\: m/s$ 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 travels at a spe )qti t1-bxhka0pn+,7b b 0fkted v in a plane perpendicular to a magnetic field of magnitude B. The electn +07f -)bxpk thb0,kab 1itqtron follows a circular path of radius R. In 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 field B a 3ce)edtvall*70x48lr iolt0 nd is deflected into a path with a radius of curvature R. If ol elt0*704cv )di lraxle3t 8a 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 orbit in a uniform m0f1syaht27s g agnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the sa 7210ysfg thsame magnitude magnetic force 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 the3edl xb 704vzz.c4xwv adb:(b 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 must be the same for the tw xzd7d b40 vx3wb le:za(v4cb.o ions?

  02.15: A positively charged particle movoi0mhb434f b0vm3w/r 58dzxqxa fa 0 1 hj3qzbes 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 magneh1ab03 qm 5ah3/r0izbj48 o zf q0vwmx3xfb4dtic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic ener;a9 dxckpt-3: qujea)gy $E_k$ 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 partica)p3ae/v u4clles is commonly determined b /v3ceu lapa4)y

  09.27: A proton moves straight up the plane of this page into a region that h +h/: tx9xr7r. wrdqvjas a magnetic field txr:qrj7d/h v x+w9. rdirected to the right. If the particle is undeflected 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 plane of the page through two regions of spa35qs(ht:( jfpx9sx h ork2ms(ce along the dotted-line trajectory shown in the (sr (kx ohftm(j:xs9ph53s2qfigure. 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 o91;yrjhr mn1with constant velocity through a region of space yn;jm 911rhr ocontaining 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 movesd84da7 yl yh7c at constant 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 direction of the electric field that exist at the location of the electron? Any electric field indl7acy h7yd8 4 the region originates from an unseen external source.