09.18: A wire has a conventional current I directeddq4db jl:8) 1tfg/o o5bd xhiq *f34po to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron aqljh1bq oo*/3)t x pfdi4dd: gbof 845t this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes the d o9 iz0/ti qzgo*3-l-thvgk; oirection of the magnetic field at the point P located directly abovi9h-o/ov qogkz 3-* t0iz;tg le the center of the magnet?

  11.34: A wire lies in the plane of the page with conventipockcy1, o. tqn6s)b uckp7jp-3y.(gonal current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward th y (,pus1tcyocq)7jn pb g3c o.pk6.-ke wire?

  13.30: Electrons flow ttxrhnp * 9cfugdl5bs53i l84 .o the left in a wire as shown. For the proton moving toward the top of the page at the instant 8 fgh.bcl9 du55prnil *x43tsshown, what is the direction of the magnetic force on the proton?

  94.30: The conventional cu69kqg47y*(itd y vix ck9v*bglykd * /rrent I in a long straight wire flows in the upward direction as s9dyx ydyi7vlg 9ck*t/ (g v*64bqi kk*hown 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, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform magnetic field ,v d27e6 ueti-ev:si0 ypq*nywhose direction is perpendicular to the particle0y 2p6e , tvnq*su-ydiie7v:e’s velocity. The particle will:

  98.10: A charged particle with constant yckc*q ;e t*;lvelocity enters a uniform magnetic field whose direction is ck *;l*;tc yeqparallel to the particle’s velocity. The particle will

  03.34: A positively chxph)hnh)k5 y2x yaw.ixjf)o 4j.g6 f8arged particle of mass M is at rest on a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is w 54hjajo6))xx xhfpn2y. f kg .8iyh)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 veo;wyapxd8 e tot73h1ie1y e*;s +h fo2locity in a region of space that has a uniform magnetic field directed into the plane of 83ye hfi;t1 o dhpw 2ao71este+xy;*o 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 ry2cs fgy4lso (zo1.bw*r f1 b1eleased 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 lb4y .cw1o s( b*rf f21s1zygofield?

  10.26: An electron moving in the plane of the page v k7:pbp9b1rocdzv;b l,m*0)au l q/n 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 l0ro:c,qbbvp7 lnd91v* m k p)u/;za bthe magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves 3 + w9vq4yaegxwith 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 at a speed v in a plane /0i ohml;8byn4 9u pow3ts0vc perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the electron travels halfwayn t9;sui3hvwcmbo 0 4pl/80o y 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.c; -b nivwu:n q, mass m, and speed v enters a magnetic field B and is deflectenibwn c-uv ;.:d 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 be the radius of the second ion’s path?

  16.44: A proton moves igd..1/gxyg+),j:b0 b j o nahoqeiqn+ n a circular orbit in a uniform magnetic field B. A helium gqyg+/i x+ joqb ),:nh n0g j..oade1bnucleus 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 to the same uniform magnetic fieqxat7 ,4:bs k6e7epey ld. The ions carry the same charge and have the same path radius in the magnetic field. Whicq xp,ksaee t4677:eb yh 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 ov)kw - 2x9p0 -uzzkzdsf space in which there is an electric 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 maintainzu0)skp9k--z zdw x 2vs a constant velocity?

  96.40: A proton of mass M and ks199qkmbj isep:d0 +s0 do/ky inetic 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 commonh; 5no o/o*p:o ktxm-oly determined b otoho;5x*o :/-kmpn oy

  09.27: A proton moves straight up the plane of th)n *f8xqy ,of/t(hsy az :c2 3tu)ncgais page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through thfqz, yc( 3xno/ tuha8cy)tn2sfga):* is region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane bk9q s(.aumb xn:x))sof the page through two regions of space along the dotted-lin.kq m b)abx x:n(su9)se 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 magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge movejmm6 -+ vc+ ydqi*ru9m w(kij:s with constant velocity through a region of space containing both adym9 u +qv+r*jmmw(c j6:kii-n
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 betweepmssl r wn .9w94yr:8mn 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 figure. Ignoring gravity, which choice best reflects the dirern lrsm s894:p9y.wmwction 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.