09.18: A wire has a conventional current I dnvjg+uh 1t;g /irected to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magne+1 hvgun g;tj/tic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best descr1:jw (rqro9bmf 8pot)mpw7t 2ibes the direction of the magnetic field at the point P located directly a8()1 wpwtq bp 7otmr9j:from2bove the center of the magnet?

  11.34: A wire lies int(fan)+bdwt x 0r/b.p the plane of the page with conventional current I shown. At the instant shown, what is the direction of the magna/(0bd np x.bfwrt+)t etic 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 sxl f7nv7u,k s:ojl3 w2hown. For the proton moving toward the top of the page at the in:fnv2,w7j 7l slu 3xkostant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a lon :.,pu;3 lp .g0yzetey/ ydgrag straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the gyplr/t e .egp,0;3y .zaud: yinstant 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 cos;zh .jo3epj +nstant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particljpz.3h;o+js ee will:

  98.10: A charged particle q+y y9 z)g7saqg1lw9fwith constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particles7+)y1a yf 9q9zlw ggq will

  03.34: A positively charged particle of mass M is at r ; xd yh70bfez9ul3zdbhtpa* 91q* 55/krtiazest on a table. A non- zero electric field E is directed into the plane of the tabtqz55x39hzyezr0*9 bdl/uah7 1;p*td a bkfi le. 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 co 1;q.kvvtt( eng63wic nstant non-zero velocity in a region of space that has a uniform magnetic field directed;(3 .1ect gvnwv6it kq 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 space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from reo 3nyso4kb 9fja*)(tg:h 0 ebxst between the poles of a horseshoe magnet as shown. What would be the dibog *x(e3 tbh)4f:ay 9 sokn0jrection of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of tu)v 7aq6hos0uhe 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 electronu)va0o7 q6su h enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves gm) jf fx2mmi8e o;x bynx4,ie3l5g( 9with 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 cqx9eo if.l,o*jo z45z4x jc 8gharge −e and mass 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 is the amount of work done by the magnetic force on the electron in4lqio e5.9xo 4ofj *z8z,xjcg this time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic f16b(v 8q1ayt +t1ohm8vdohnnield B and is deflected into a path with a radius of curvature R. If a second ion ha 1oy1m +1 v8hdqnnot8v(h at6bs 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 cirijkmku*+g,xq7c n 8heodw. 3,cular 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 magnetic force during its motion, what is the ratio of the speed of the helium twk,ndkec3+u mxhj oi *,g.8q7o the speed of the proton?

  10.43: Two ions travel perpendicular x, 3e nsl/a,kgto the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for the two ionsls,,e/g xk3a n?

  02.15: A positively charged p;dh8bhsh28nqipp48jy (;wsq article moves to the right. It enters a region of space in which there is an electriq;8;hpnhwj 2d(qpi 4s8 8 sbhyc 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 velocity?

  96.40: A proton of mass M and kinetic energy u0vaddcz00xy38 fd*u$E_k$ 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 electri h36f9:9b znohj.o-h n5 qinrically charged beta particles is commonly determined by q3 z956nifj9-: orohbhnh.n i

  09.27: A proton moves straight up the plane of igbxa7 9 1b wzn) h6-w(.*gdm.ykxbwxthis page into a region that has a magnetic field directed to the right. If the particle isn. bz xaww db.7(9hki*1xw6) xbmg gy- undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron mv/+ ncvwb)ba :oves in the plane of the page through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Rega:c /n+ wb)bvvion 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 through a region of space 8.)zpowjsjn+49 gzlj containing both zn8o+ sjj zpj.)gw 4l9an
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 mo4wlcv69a (axs :ein-u ves at constant non-zero velocity directly between two long straight wires. The conventional current in each wire has the n v9cewi64axl( :aus-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 electric field in the region originates from an unseen external source.