09.18: A wire has a conventiozt. -1aar-ujq nal current I directed to the right. At the instant shqa-z. arujt -1own in the figure, an electron has 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 figure, which choice bhf293k0akhgu est describes the direction of the magnetic field at the k f9gh2ka0hu3point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the pagejw zbr. /pzwuuwc8dd3m+3m0 + with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directlyd.w8d3mwuwjuz pb rm0+/+c3 z to the right toward the wire?

  13.30: Electrons flow to t,fva4g 45ij8kk jg:rrhe left in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction off4vk8g r 5jg:kri,a 4j the magnetic force on the proton?

  94.30: The conventional curr; -bjbr3v6o jment I in a long 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 toward it, the force on the v3;jrb j6 -ombproton is:

  95.16: A charged particle with constant speed enters a uniform mait/ o:y ly5* (oc82cb,xbil6q nh6x+n dxe sp1gnetic field whose direction is perpendicular to the particle’s velocilxi2*5 isn y,xqc8ocn+yp l b1:/ (bd6oex6thty. The particle will:

  98.10: A charged particle with constant velocity enters a :+vt5cx, t;0uvkhih sa6 tyf2oe):gfuniform magnetic field whose direction is parallel to thtk);tiyvx f tg u::265csa+ef o ,hv0he particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a tablel5,pqj v+u1eaq 6io;(o 0cvfw . A non- zero electric fiej6o1,lqcvwvfeo (a+q u;i 0p5ld 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 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 con bo)frt; 3co8 4zfxqkoiud .7.stant non-zero velocity in a 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 the direction of the electric field in this region of space? Ignoreo i ;zfo8dbr4x.t7.3) ofckuq gravity

  04.14: A positive electricnt r;dpo*b5 wowwx/m9t*k5 . r charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetptdnr o;xrw5.wm*5w /*9ok tb ic field?

  10.26: An electron moving in the planex26+jcp6ibvn 1nl ct ) of the page at an angle of 300 to the horizontal enters a region with a co12 6+6vxbccpt jlin)n nstant 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 m4ql-1yiid+ yb oves with 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 wcumb 5; zbxu5o p l3;herp ki2:2jo/7mass m travels at a speed v in a plane perpendicular to a cmx;oz5 upr p3j:o2bbe/;whi7 ku5l2magnetic field of magnitude B. The electron 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 qc2f sf/g p-f/e, mass m, and speed v enters a magnetic field B and is deflpgscef 2ff -//ected into a path with a radius of curvature 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 orbit in a uniform magneticxbwr.1.7dmqy)do8xh7ls: ry 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 helium 1)7obymsr8hrlqd. : x7 xd.ywto the speed of the proton?

  10.43: Two ions travel perpendicular to the tq*)r)twz8ib same uniform magnetic field. The ions carry the same charge and have the same path radius 8)qz*ritt )bwin the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. Itl l,6 cljs--gb enters a region of space in which there is an electric field directed up the plane of thj-lc-l 6lbgs, e paper (see figure). In which direction does a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic(qa0(uhfto:c0 seg :l1ps4ch 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 c/ hdll4cvql lcn -.:j8harged beta particles is commonly determined b:8ll4 vqcnl- dhj.c /ly

  09.27: A proton moves straight up the plane of this page into a region that ha r0; h;hvlndx9s a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what directio0r;l v;9hxnhd n must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regionsw-+y u*d(quyg l5) m)hqi- yzk of space along the dotted-line trajectory shown in the figureuz(qu yld)+q-h *w)yiy-g m5 k. 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 mov15(la p;7xd9s(.y)mqmwwyo dc pbj m4es with constant velocity through a region of space containi4cyojdxmm a7(1 9pw b s;d)lm.( 5ypqwng 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 constant nont sl +pi(q//2 r mppas9lkml9)-zero velocity directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite d(slmp pim+/pk9 /a 9s)2l lrqtirections 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 external source.