09.18: A wire has a conventional currentwqvq . osaahwr 0v9s9sd )2r*glwhpj5 66cb1 : I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on thl av61.wsg0c 6brrqp h29os:das59 v whq )wj*e electron at this instant is

  14.24: For the bar magnet shown in the figure, +mkf;1kff f2 s0llj*rwhich choice best describes the direction of the magnetic field at the point P located directly above the cent +kljfk 1*l; f02mfrsfer of the magnet?

  11.34: A wire lies in the plane of the page with conventional9n+s 98f0uw5 zy*x2a9sulzroy18o lafv r7p k 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 towauw29aosp19yo5 *l k 0usv9frlza zyn788fx+r rd the wire?

  13.30: Electrons flow to the left in a wire as shown. For thkzza :dx+)2uhqhl 5y- e proton moving toward the top of the page at the instant shown, what is the direction of the mz-hd+h )l5kq:a2 yxzuagnetic force on the proton?

  94.30: The conventional c o46h.rmrft i8urrent I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At thmiho trfr84.6 e 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 magnet8k4guskm du 0b4 5zlw .g+y.ekic field whose direction is perpendicular to the particle’s vges8.4kgz4 yw lbd +0uk5.uk melocity. The particle will:

  98.10: A charged particle with constant velbu.9 o9g) akazocity enters a uniform magnetic field whose direction is parallel to the particle’szaak)u. 99 bog velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on4kc:zl1:+gl mdt xq dcm(5 9xr a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetir:1zxtc9 d (lcgm4kq: mxd5l+c 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 no5-gx(f h qcg2dn-zero velocity 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 electric5q-dgxhcg(2 f field in this region of space? Ignore gravity

  04.14: A positive electric charge of negq ;-mpd oijr+1ligible weight is 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 thom1- q r+pij;de magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 to thec fj,i*p3un,/ 8lq)tjhhx l3o horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as show 3n) /c8h,*hxu f,jopi l3qjltn. At the 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 moves with spe xe 6r;+5( cdi, lehony)if3qb s+5u tczw-m0ded $1.00× 10^3\: m/s$ 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 charge49qrf /yjmsjj,9e ,jx8z.h qu −e and mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follo.x4 jr/u9j jqs,,z9ejh qfym8 ws 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 fieldmhf g;93nc- 1q(gkby(qxud/ hmom3y. B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, andd h( qg-h 33fb;(mu xq19gkyom.nm/ yc 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 field B. A hel/ uq,165jb /3 gerc,px7tbthv8 sq9i+ki lnckium nucleus moves 7i e3,b96ct1t ,kn5 srl/ h u8 jkv+qqcg/ibpxin 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 field. Thv)cfsaga;4j +e iongcjf s;)v+4 aas 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 ions?

  02.15: A positively chuy8 rgzthn /7l se0;qh;1ar)s7grp+qarged particle moves to the right. It enters a region of space in which there is an electric field directed up the planeh+ ;tn r ge)8s p7zhygrl/qr;a1qus70 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 emm:dr4lp bh-6nergy $E_k$ 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 char)8h duhov5cgg7we5y 4q2w 6bdged beta particles is commonly determined bhco) 2gd v55647wybdq geh8wu y

  09.27: A proton moves straight up the plane of this page into b;o1)rder w: a9;dviva region that has a magnetic field directed to the right. If the particle isdirr b) :d9 vwoav1;;e undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through t9m g:)ubqihq 5*yrb3x 4 ej3nit p:t;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 magnetic field in regions I 3t j: p39b;mi*ntbrxq5:huqe) tyg4iand II?
Ignore gravitational forces.

  12.36: A positive charge movev-m 6ujhr)b: 2vu3zr ms with constant velocity through a region of space containing mvj:-rzh23 muv r6u)bboth 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 constan.z suoj4v)0pt t non-zero velocity directly between two long straight wires. The conventional current in each wire h) .pj0tv4zsu oas the 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.