09.18: A wire has a conventional current I directed 7p uz)p4hs-rs: uh.ayto the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magneticazp h4y)u-s:puh7rs . force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which ch+qyry.*,c1 e5pudt uh oice best describes the direction of the magnetic field at t, cu1yqedu p5t .*h+yrhe point P located directly above the center of the magnet?

  11.34: A wire lies in theg(mpo5-3g 9s gwmv, ka plane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the elecwp,5g-m(a mvk9s3 ogg tron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving 3jih tp6, or.m.3xwum i19cortoward the top of the page at the instant shown, what is the direction of the magnetic force on the protonu1to, 3hioipx m.63rwc.9 j rm?

  94.30: The conventional current I in a lon8ks 0 12dqj5gvqn 5mbkg straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.)q51k 05snj2vgq kd8 mb 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 ma9x5vxbr w c;pm1b2n tr i)hka6ai(-s.gnetic field whose direction is perpendicular to the particlprw1x(9i )bv r na.h s2xtb5k6m-ac;ie’s velocity. The particle will:

  98.10: A charged particle with calx7di2-,1 nmpt ;2u *zruca fonstant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particle wca*- nau,u7i2zdf1rxl m;t2 p ill

  03.34: A positively charged particle of mass M is at rest on a table. fheefoj s-3/+sw q/3lccc 9+;k st:f sA non- 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 tho+c9c;hqsffcel 3ks+/ t -3/:swefsje 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 velocity in a regia q k8gu )*:./ ljsjczp72aelpon of space that has a uniform magnetic field directed into g8*7).j:/jpc2q azapl usk l ethe 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 electrcdz; 75 cw.ea6r faqd7ic charge of negligible weight is released from rest between the poles of a horseshoe magnet as shrcddwza q 5f7 7.c;e6aown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the pag:ac,uv w mx9c5x2 cr,we at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane ofra:5 c9x,w,ucxvc 2 mw the page as shown. 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 ada6fv1bgg:+t p53z v4 zm mhkf3h3g3speed $1.00× 10^3\: m/s$ 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 travt5)z k/waqj*h niqy,ct.e1p: els at a speed v in a plane perpendicular to a magnetic fc/e5 .a)tktq :ihjwz*pqn ,1y ield 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,u7p g ri rvu;t4wzy7 (+wwi:e, and speed v enters a magnetic field B and is deflected into a pieuy (7rvwigzr uw,+ ;w4t7p: ath 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 a circular orbit in a uniform mzc09fifr-: gyagnetic field B. A helium nucleus moves infrc z:-fi0 yg9 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 unifors:*,/lh l r6s atfcq:6rx6 vemm magnetic field. The ions carry the :qct* lfvre6,r :a6hx / sl6mssame 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 charged particle moves to the right. It enters a region.f gd44n pc/iu of space in which there is an electric field directed up the plane of the paper (see figure). In which direction does a magnetic/igdu4pf. 4n c field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M anj:8x:jl(6btbj g s( jvd 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 is commprto pm6tlj **l9 nj-o5x1-pjonly determined b-o mtt-6p1lpj lr*x oj*j5n9py

  09.27: A proton moves s,.p9q /o9sjwi n;xrxa;pd ;gctraight up the plane of this page into a region that has a ma9rg /9dx ;aqp c,ixpn.j w;os;gnetic 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 gravity.

  08.36: An electron mo 8yeyinzo+rne)k 2ny4 .7,iq ives in the plane of the page through two regions of space along th8k4n.oeqiziye ri7 y) , n2ny+e 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 and II?
Ignore gravitational forces.

  12.36: A positive charge moves with ckbaw-hk tkkc 29txfs m*:k *(qbk9i;) onstant velocity through a region of space containing b:ts*;k)akxk 2ck9k (9bkim- htwfq* 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 veloci r -g tu7q3o7u://anqb1gbahety directly between two long straight wires. The conventional ug:bueg 1q7/aah3oq/tr-n b 7current 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 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.