09.18: A wire has a conventional currentc5 x +w70rktfb I directed to the right. At the instant shown +cfb5rx7t w0 kin 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 best describes the 0kl :poqb)ftys8 zit -1(h(ch direction of the magnetic field at the point P located directly above the center of theo(b8sytlchh: 0f-ktqz)i( p1 magnet?

  11.34: A wire lies in the plane of the page with conventional current Iade p xbs :/:a3ikd.q/ shown. At the instant shown, what is the direction of the magnaa q . xe::bdidpk3/s/etic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wireb c4e11 (d++bhuq 7pojy( .;hnop;/y vjwgooy as shown. For the proton moving toward the top of the page a( h pj++/yobd gnow ;yj1c;yvuqb.(e o71oh4p t the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional curre smucrx( ;3j6qnt I in a long straight wire flows in the upward direction as shown in the figuju3m( ;csq6 xrre. (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 constant speed enters a uniform magnetic fvzj5uz 1 so qcfa 57b,*3n,lfbield whose direction is perpendicularcjn5lb buv ,zzf, a5q37of*1s to the particle’s velocity. The particle will:

  98.10: A charged particle with coc1f ofzk ,+z/anstant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The pzc f1ao +zfk/,article will

  03.34: A positively charged particle of mass M is at rest on a table. Az /f*6i)rw 0sexix+h y non- zero electric field E is directed into the plane of the table. A non-zero maifrz/)+wi sh06eyxx * gnetic 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 constant non-zero+7pqbt w,o.-3dwz srb velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The prot,qtp zbow.7+sdr3 w- bon 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 electricp w 36+afy/zwm charge of negligible weight is released from rest beta6zwpy +3m/fwween the 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 tx(9b1;c 0svfs d1dm kjhe 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. At9s xsdbvj( ;mdc11kf0 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 movea 4dl+ l +6,bbpg rxi)bd.srj5s 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 and9g:c5r7ajw at mass m travels at a speed v in a plane perpendicujrgw5:a7 tac9 lar to a magnetic 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 q, mass m, an knq enr1frkfw mb y+:kt80).bg;k3v2d speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has2 :b;0318 nnq .wbkrvfkm etgr k)kyf+ 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 mb x6ksco)6rm6c/xcp nrs p1 a:du83-xo4b;ccircular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic fixos16/6ncp: 4cx 3ubbrsa ccmp r;6m)8o- dxkeld. 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 to the same uniform magnetic field. Thcyk*vwp4,xd.7s itx0ptc92 y e ions carry the same charge and ha ctpxpkc* ivy2 49dx0t,wy7. sve the same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged par h7a-5:d b*kuxlu8 gmvticle 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 constant velocityulgv5 h u*8:b7mk dx-a?

  96.40: A proton of mass M and0lv8bn fe,j2egp raq(8ewc/8 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 particlest/ct *6vy h4dt is commonly determined b*dyt 4/cv6tht y

  09.27: A proton moves straight up the plane of this page into a region thatw2.fu1v7 zk b(a0sqy;c yu; mc has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction must there bc swyf.; ;27u(mqcvay 01ukzbe a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of tvfb ui e0:uk i y-glsy+kn*)2r2;5ydhhe page through two regions of space along the dott0lk+vr ;uybfg-iu2 yh:n d y*sk)ei25ed-line 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 chalnj6,x 6u d7 x4knrq0hvt*w0rrge moves with constant velocity through a region of space containi0j utr7hq*k wrxnlx,d0n646vng 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 mov jhu .k5lu-hhg+sg0x6es 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 elect u+g l. jxuk-hh650shgric field in the region originates from an unseen external source.