09.18: A wire has a conventional current I directed to the right. At the instay0qa/5s+wbiw nt shown in the figure, an electron has a velocity qsiwa5b 0 /+ywdirected to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the fux4. yfk1kfw4 igure, which choice best describes the direction of the magnetic field atk.x 4f41yw kuf 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 showr(locth(93bwigp- mdu 1f *7 g8 2wplvn. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly vl2o1 m* c((w -9g wp3uirg8p b7htfdlto the right toward the wire?

  13.30: Electrons flom8njsa n1sn49wgcb*; w to the left in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the m njswnn;4a1m9gsb8 * cagnetic force on the proton?

  94.30: The conventiona(l 98ys zr,gykl current I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow ik zlrg,y 9sy(8s 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 particlcbk7 ay6dexgojqaw6sq::4 v;4 e1fi6 e with constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velociq:s1e ix4 o yk;qw6 74a6jgf :eab6dcvty. The particle will:

  98.10: A charged particle with constant velocity entans ;t4iorin+,; l+ mlers a uniform magnetic field whose direct+;;oanr+til n m,l4siion 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 lo 9n1ilhsk5 nm9(7qw bgm6w0non- 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 magnitude of the e(w h 9n1905qiwbgoslnl 7mm6k lectric 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 space tha j*+twxjqf8* b sjd18bt has a uniform magnetic field directed into the plane of the page. The projdjb *j88xf+*qt 1 wbston 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 charge of negligible weight isxfw1 gaz f2s:( 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 the magnetic field?f a12zs:g fxw(

  10.26: An electron moving ia1dkp 4:tiha0(6get x.ro+tq n the 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 ip+dh o:t( rttk160 a4 e.xqga 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 movesn4 sor4)a 4kmw 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 and mass m travels mmz1 e9(7s -yejuu+d 4:qx oajat a speed v in a plane perpendicular to ae1oyzx9m ej+7u(:a -s4mq ujd 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, and speed v enters a magnetic field B and lc8p2aklz1e 8 is deflected into a path 8ek8caz12 pll with a radius of 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 hn9 6)2 dm;qsvre jfc5;fc.sui f;w(k a circular orbit in a uniform magnetic field B. A helium n wsf;v.jc; r(; dinfs)5kc emq6 h92ufucleus 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 speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to5py 7p34fnfoa the same uniform magnetic field. The ions carry the same ch5af7on p4 p3yfarge 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 particle moves to ;q053m o+*f7nu)i:1 tcm6svgaf wjxnf uyq 4zthe right. It enters a region of space in which there is an electric field directed up the plfqj6 wm5ifu0g+ s*7qtxmyuz1n3 :n af4c); ovane 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 mass M and kinetic 0gi7t:z w+wrz8bre.gv u.nv:s d;et-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 part2--rvgm-om5lzd1 mq8q mx+ w licles is commonly determined bym5 +zdor -l1m-w-qm lmv x2g8q

  09.27: A proton moves straight up the plane of this pa zeai6+d 9,mc :uv:encge into 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 must there be id9u: :c,cva6zenm + ea component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regioiuvwpbz wx lxb ow7(y-363 9swn436zjns of space along the dotted-line trajec bui 9n6w34j xyo(swb6z7lw 3 v-zpw3xtory 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 moves with constant vea5*a2niz7pjl7m g * kdlocity through a region of space containing both an dlk 75p*n *2aja7zmig
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 2u*w q-z jmxq6c4(fs gdirectly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in oppo4 mxfc-q*w6z 2sqj(gusite 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 originates from an unseen external source.