09.18: A wire has a conventi ip:lau ;)u2kf4w )qqnonal current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnet2qk4)w:p)i ul;unf q aic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choiuln,sa )g3 wi2 hsl52wce best describes the direction of )gs 5lswl hiw2nau23,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 I shownwhla+ 3bf 9m exz- b)lkh*h0u8. At the instant shown, what is the direction of the magnetic force on the electron thatax0bef83h +)l9lbwm*h u -h kz is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving towac,6d ;njx*ns rrd the trjx6 s*d;n, ncop of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a ljchfr :q4wel *u yn0 a0v64ux0ong straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At t00wjfq alr4xe nhvucy u: 60*4he 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 field w- dn;it z9dit9j1p 4tihose direction is perpendicular to the particle i1dtpit9-94idtz j; n’s velocity. The particle will:

  98.10: A charged particle with constant velocity entec24n ktvqyu/82 2v lxyrs a uniform magnetic field whose direction is paralle kluv/8y22 2txcyvq4nl to the particle’s velocity. The particle will

  03.34: A positively charged *o v2glf7i,fy: vbx3 gparticle of mass M is at rest on a table. A non- zero electric field E is directed into the plane of th7:v2,gi fbxf oyv3g l*e 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 w byuby bfp6j/,/s9d5space 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 spacy/f ,sdwbuby6 9/p5bje? Ignore gravity

  04.14: A positive electric charge of nytvy v3(ha 59aegligible weight is released from rest between the poles of a horseshoe magnet as shown. What woh 53avyv9(tayuld be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an ani nf38/ryq 9pgg x/ti.gle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown 9x8.yf /3pqgirit n/g. 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 speeh s4-5o5hpdd-p* 3pnz d.tqhcd $1.00× 10^3\: m/s$ 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 ma; :rpbb2i j+mqss m travels at a speed v in a plane perpendicular 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 imrb:ij2 pq+ ;bs 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 axf6j ek+.f2sj,p+mi magnetic field B and is deflected into a path with a radius ofkx+ p2a j, msj.fie+6f 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 dq ,,exa :su;radanzkj/av.9. ii f 6pa, 5s2bcircular 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 magneeb,ak2s5jf:u.i a, rp /;6qna,d .iadxva9 sztic 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 fielddd z 1+ v5hrnvfa5*.hd. The ions carry the same charge and have the same path rdrzf+ 5h .51vn*avdhdadius in 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. It enters a region of sbupm /sunlsf1-3 4y4 mpace in which there is an electric field directed up the plane of y- m4uf1ulbsp3m/4ns the 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 a *v bk ym6d o)pj-llxau3gag4q(gh :38nd 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 particles is com dhb/y 8.*x c6wc+sz4rfc/iu kmonly determined b4z/*8c cwribyh.6 usdx+f / kcy

  09.27: A proton moves straight up the plane of this page into a region that ha ku4c 0xv iq rynuhglm2sy;)4,,i r07rs a magnetic field directed to the right. If the particle is undeflected as it passes through this re luxir4 cry 00m,uhvr24q;yk)i7sng,gion, 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 ofn sqgu5)rzx3 urh()c,rhdi-4 space along the dotted-line trajectory shown in the figure. There is arcu-( xri))34 , rh hzq5sudgn 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 with constant velocity t,kx:1rj eh7 rliz 0 7smr);jbbhrough a region of space cont71hrlr:smi)bz0 7 b k,je;rjxaining 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 velocityklr76itul; o p0ak z+bpx bw cz*3t641 directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite directionb6cp zzpkb;0+ot 73 aw x*i6ku1ll4rts 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.