09.18: A wire has a conventional current I directed to the right. At the ia l- 8/spr9czznstant shown in the figure, an electron has a velocity directed to the left. The magnetic force on th9l/sazcr8z p -e electron at this instant is

  14.24: For the bar magnet shown inpf qh0*qv8:/ qxmzu*q the figure, which choice best describes the direction of the magnetic field atqpm:z**hqv uq8 f/xq0 the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with convent0z3p 6k m:hkak -54y unizvkq e6sg(*2cdhz7wional current I shown. At the instant shown, what is the direction of the magnet-7uhn0zivah z6k2q4 k (* zy3kce6wsdp :5gm kic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as show.w*8mf 413op4(dv zadze gmuijm ;b)ln. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the proi o l3fe;b(4jwmvdz8am *zpd.4 m )g1uton?

  94.30: The conventional currbzk7 i-p/ az5jent 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 fza7jkbi/p 5-z rom the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform magpmi il(ve28mlg qy9- /netic field whose direction is perpendicular to the particle’s velocity. The particle l-iq2gm /8p9vm(eyil will:

  98.10: A charged particle with constant veloc1jxdd 4 0tt0zhx m1b3aity enters a uniform magnetic field who1zd t34bd1h tm0jax0x se direction 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- zx 8c-kx-hsr/ kero electric field E is directed int-krx- xkh 8/sco 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 constant non-zero velocity in a region of sp elix24+j k.qz xqumu(yg1;i)ace that has a uniform magnetic field directed into the plane of the page. The proton moves directl xj iqiy mugz x24u(k)+1.l;eqy 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 charge 6+y)zhv 6o5i 7zymdneu 6d;rg 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 do)+ viuzdz5r7y6h m; gnye 66the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 30 n6/d4+gusjo 7ohsvgsr o(d0iz6) a 8x0 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of thh76 /(dorgaovnj6usgz)i8 0 xsod+ s 4e 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 spe(qsaldlyu5h5* oq; p; 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 travels at a speeyo 8 -v30zefi:myez4a:*d yipd v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path oym83i yez4zy:p0do:- vi af*ef 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,eyz cp4 a8l-e9b9yn jxuwc aju8p)1+uu37 i4e mass m, and speed v enters 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 unchanged, what will bee- jn8c173x wepy8 u+l) 4pbz9yjeua aicu9u4 the radius of the second ion’s path?

  16.44: A proton moves in a ciq 2 :n(qba d(-by b.rsxql+uy3rcular orbit 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 magny2 qqsu- l(b3nd: +(qb.rya xbetic 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 fi96skmp voqx p7 s4ap09eld. The ions carry the sameos k4p s96p9am7vpx q0 charge and have 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 wgvvam , z pqz6 s7x4qv35vq;omih)+5 particle 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 h vvqzqvmgsoqhz 5),i pxwvm5 a+47;63ave to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic energy .rfi i+rkr61zp7,stb $E_k$ 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 part z 3 0-onern23juq b2rx,ps*teicles is commonly determined bnq 3pjrt*0 sor23 x, -u2benezy

  09.27: A proton moves straight up the plane of this page into a region that t(hazwtcb .athl89 jak p /-/2qp p5*whas a magnetic field directed to the right. If the particle is undeflected as it passes through thiwa (8twbh/9 2pa*jtpzkqhclta5/p- . s region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the p o6:hw.h 9kxxuage through two regions of space along the dotted-line trajectory shown in the figure. There is a unwxhh 96u:xk.oiform 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 wi-*8i: 3b8i0maryncc40 wjszdwot v3bth constant velocity through a region of space cy3- 80m: 3c wia0dtnovz8bs *rwb4ci jontaining 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 non-zero velocity directly between v -/f.g )rvukbtwo 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. Ignorin -v r.f)bkg/uvg 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.