09.18: A wire has a convei+tmx1tp*psl857ot ua g a6*jntional current I directed to the right. At the instant shown in 18to+*xsjtgupa *a6m7i pl5 tthe figure, an electron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice bestcby6 0jpr: 1kj describes the direction of the magnetic field at the point P located directly above the cente pbckj160 jr:yr of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I shown. e -*wl 03ybtv5ykt/qoAt the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wb5-w3y v/ ytek0*t lqoire?

  13.30: Electrons flow to the leq7oht 8xdq 8.r;t5 hckft 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 magnetic fq.5q 7 tcr hto;8x8khdorce on the proton?

  94.30: The conventional current8zde )mrh2l9t I in a long straight 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, the force on the proton8h tr2 l)edzm9 is:

  95.16: A charged particle with constan jlk,e8.lldtu0x+i9ii *n u6n bswu.9t speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle wil6xdw0,u.bl iul ns 8e9ti 9i*ku+.jnl l:

  98.10: A charged particle with constant velocity enters a uniform magnetic fielv1 uki m9o1ya6d whose direction is parallel to the particle’s 96i 1vok1ymua velocity. The particle will

  03.34: A positively ch2gwxt( zvx a tl+l*t(7arged particle of mass M is at rest on a table. A non- zero electric fie t ((ax *2ll+tzwx7gtvld 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-zerj26+tvbg c1- ch2eypb7 oo+au o velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves dibt chubj71+6-o2oy2 gev +acp rectly 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 releasgz. m1bnbwvf*:v9k -* uo0hd ded 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 fvhgmd *91 f0o:v -k wnbud*zb.ield?

  10.26: An electron moving in the plane of the page at an angle ol9krv/p 98s 5fvf sj e91.xaauf 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 faffl ja5 8pe.9 9svr9xk/ v1usield, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves wsqw hgu+d m+ybk21h4 e)3yp )eith 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 6dsgponw 6e z4,3 g8gyat 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 mag6 d8ys zw3,oeg4ngp6gnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, ai cbnlf( hg1;w6pnd:-u -1w3s0sl tck nd speed v enters a magnetic field B and is deflected - 3 01hs- kidu:b6 gc;(pf1 wlsntlwncinto 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 a1tyb uda/,2mh 4cx2h in a circular 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 o,4amh2x/ 2uh1dyb a tcf the helium to the speed of the proton?

  10.43: Two ions travo y sl9o+qrqwvj(a10rr6r4 j3 el perpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic v( a r1yjoosj9qqw6 r+ 30l4rrfield. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It en4ql0/gb 362 yezhpvi gruciu5e ).s *(mhn2itters a region of 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 partiu2i( he yr5nbig30/lhv4 q*.)gesu6zimc2p tcle maintains a constant velocity?

  96.40: A proton of mass Myh(gy wej1c. hpqp5x(lv02 ldx)y n:: 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 ikl, a(h d58t:+wqgjre s commonly determined blke t(h8w+5 :ja,rqgdy

  09.27: A proton moves straight up the plane of this page intvohl/52pq 8hl o 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 a component of electric field? Ignore hpl2q8h/o l5 vgravity.

  08.36: An electron moves in the plane of the page through two regions of spacc n k4 30fm+jr-: h,sxtksxys o2n-0mgacqv/+e along the dotted-line trakqcf4s x0 n +0ck2o-hm+:s r,-mgyvntx3/j sajectory 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 moves798ptd7cc fcwyvo g :) with constant velocity through a region of space c:cocc yg)wtp 8d7v79f ontaining 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 velocity directlyyo(f:k1ifw ooid 1e dx(:d ;c) 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 figure. Ignoring gravity, which choice bo(e1cd o fxi1;iw:d y)o(fkd :est 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.