09.18: A wire has a conventional q r/m 42dbd7ox)jv+ bvcurrent I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic fqd/27x4bdv vo)b rm+jorce on the electron at this instant is

  14.24: For the bar magnelsa z/azx(q , s82l,vet shown in the figure, which choice best describes the direction of the magnetic fielzal 8/zxes ,,(l2svaqd at the point P located directly above the center of the magnet?

  11.34: A wire lies in the planlx lw4+lul 8 i0;rt uuz7+8jm 4x.mxzbe of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic forcel rm87uxu4z8x x j;40zu+. mt lwlbli+ on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left o94+f yhhr0tmin a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magn+ohf0 4mht r9yetic force on the proton?

  94.30: The conventional current I in a long saqos(kykt k1x- *3 ca.plw02ytraight 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, thekkkl ax30pa1 y*-t2oy(s q cw. force on the proton is:

  95.16: A charged particle wi m7 yb (*(,occlfo,cljth constant speed enters a uniform magnetic field whose directiy(7jlloccbcfm(o * , ,on is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters qne/iq5cjqn (k02pz 0a uniform magnetic field whose direction is parallel to the particle’s velocity. The particle wi2nqep/z qkc 0jn(5 q0ill

  03.34: A positively chargeh3pw4a 7 a0zakd particle of mass M is at rest on a table. A non- zerp a74a0a3wk hzo 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 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 velocith rb -vq raju-dtzfj))e(rhy- 6: i:o;y 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 fieh)6 -;vty o r:r:duej)h r-fj -zqaib(ld in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released f3fbro+ yq n:;brom rest between tbq:y rbnf+;o3 he 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(r.09x jlsz76 tn+uk yqo sks7;br9 pj60mjdk plane of the 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. At the instant that the electron enters the magnetic field, which best describes the direction of the resulting 6 opr06d9tsrx.7um9 s7njjsq0 jkkbly;+kz(magnetic force on the electron?

  11.29: An electron moves with sf)dw8o2hsem+.aob ns +e7co3peed $1.00× 10^3\: m/s$ 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 a +x-kdb36jc:xm toz0zplane 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 is the amount of work dondt k6co-zxx zmj +03:be by the magnetic force on the electron in this time?

  97.28: An ion with charge ve;v8y/q-)u. cfcs9w ssaht + q, 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 iohs/ tsu)+vse.yq- w8 ;facv c9n 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 magnetic fi 5 4 mzrp;q4xej:e4p;zcuo 1iweld 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 5 irw44em4o :uqze cj ;zp;px1speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular*o 3 7;vtdmnpp to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field;3*ompdpvt n 7. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged partic;4mb6t3jfqv8 we ti*lle moves to the right. It enters a region of space in which there is an electric field directed up4m qiw3t 8lb;6*jft ve 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 velocity?

  96.40: A proton of md3u+. kp8vw *j)nyqv yass M and 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 1v,rs8:ialtp is commonly determined by r8ts i1:a,vpl

  09.27: A proton moves straight up the plane of this page kn.mu5 d-oy*xinto a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction mnd-u 5* koymx.ust there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of ww 13.d7je pks(t0rcee5 c*lwthe page through two regions of space along the dotted-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 magsj(c t 5w3.r1ewl eek7d *cpw0netic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity thve50 /u q81p(jnilv;li:mm4m vb g:w lrough a region of space contain/; 8m:eqvg ll 1bjinl(m:p wmi5vu 40ving 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-zev 8pcr1*ojgpe:p: nw-ro 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 wp- *pvj:g e8:crnop1 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.