09.18: A wire has a convem4s(+cc pfsi* ntional current I directed to the right. At the instant shown in the figure, an electron hs +4csc*f (pimas 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 f67(qus 8u zkvligure, which choice best describes the direction ofkslz87u (q6v u the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I1 -zfg1 csxsv0 shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the rightg1x0s-v fs zc1 toward the wire?

  13.30: Electrons flow to the left in a wire as q e4gnrb/s ;lt;0wc1ishown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic ;lrqt0 snbweg1ic ;4/ force on the proton?

  94.30: The conventional current I in a long sbe (zoqo:g(97f-tm emtraight 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 mz(o fo9 gqe:bm7(t e-R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform magnetic fie6; hjxqhnxgrj,re) 53ld whose direction is perpendicular to the particle’s velocity. The,;jr5r3nh6 xxegq)hj particle will:

  98.10: A charged particle with cons;1lz1nkl)qs5 x6dp yftant velocity enters a uniform magnetic field whose directioq)f py61 l;lsk1nx 5dzn is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A non-omtzek+t ;8r jam3kl *z 2-3zk 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 m3m kak -roztez +t3lzmk ;8*j2agnitude 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 vel xo2k*zauob3x/,9hmc ocity in a region of space that has a uniform magneti9uxz x oa/co*2m3 ,khbc 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? Ignore gravity

  04.14: A positive electric jy+vv1jyaf) 7charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction ofy+)vja vy1j 7f 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 300 to the hora 51ipse06ok uizontal enters a region withk1p 5e u0os6ai 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 swrr( ctfl7 ,l3peed $1.00× 10^3\: m/s$ 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 speed v in 3s07r +0ghgk yfgciq 1a plane perpendicular to a magnetic field of magnitude B. The electron qg7 3ygksi+100f grchfollows 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 enterg3 7/ p a ew/x,mm(cg9elwk8bds a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchang 9ck (wm8egdwbex al3,g/m/7 ped, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniformz*+ejvr63d4b qv uah5 magnetic field B. A helium nucleus moves in a circular orbit in the same 5a+z b3 jq64dvev u*hrmagnetic field. If each particle experiences the same 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 :qh6+23;.lbb v f2 xe inwwnanto 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 must bew aq.;f:xn+6 whl3ebbnvn 22i the same for the two ions?

  02.15: A positively charged particle mover)(vun8zx ew3d d1lo0.uw 2lbs 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). Inue8 w13ul0.dx)( 2lrb zwnvo d 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 ener5*ibbzi (mq:4yg ,pgcgy $E_k$ 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 commonlv/ dkug3n6bcd;* fri6y determined bydcf n vd/6b3r*6;kig u

  09.27: A proton moves straight up the plane ozq 1:vz9xw -ghf this page into a region that has a magnetic field directed to the right. If the particle isg-zqh: v w91xz 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 tho ++.helee90c / ly2ioyw/bzt rough two regions of space along the dotted-liil+to/ceew.le 0o hb z/+y9y2ne 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 mov 1://b,zwi+wj3 dfegkrf s,tx8y (rwies with constant velocity through a region of space containing bo,xw(ii3j rgbw:/ 8fe skyr +fw1td z/,th 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 non-zero veloci 4q3u6r0qbbvc*;bbsbf.j iq yd,+6wq ty 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 in the region ori;bq.qd4bcq+w*qi rs6y ,b3 f0vjbu b 6ginates from an unseen external source.