09.18: A wire has a conventional current I d+;ls t 2emc trp+,o;dgirected to the right. At the instant shown in the figure, an electron has a velocity directed to the lecsd e2 ;om, ttgrp++l;ft. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best descj drg/xzd u( /4biyb/-ribes the direction of the magnetic field at the point P located directly abov/z4id- xdjb(by /gr/ue the center of the magnet?

  11.34: A wire lies in the plane of the page witc 2m chkf ei7(npbn47hih8+*w h conventional current I shown. At the instant shown, what ishcic2e p4bn8k 7i+*7n(fw hhm the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to fx: 8ui/q vg3(d ,as9nb;jl utthe left in a wire as shown. For the proton moving toward the top of the page at the instant s;vqa8,btn 9x3/sd g :lj(uufi hown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in/qxrwisu v)vu7./3bnc(( zel 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 (znsxu wv ql)b.veu/7 c3(r/itoward it, the force on the proton is:

  95.16: A charged particle with constant speed en 7vj:foxmx9sp15;ze hters a uniform magnetic field whose dire91soph:x 7 xvmze5f;jction is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform di- zln+pc;:a ay)i: o a4p+rhmagnetic field whose direction is parallel to the particle’s velocity. The +rn liza4io:dc-p+ay);:p ah particle will

  03.34: A positively charged djy6jpg 9 38z/vai a* 5szu4meparticle of mass M is at rest on a table. A non- zero electric field E is directed4m8jz /a* d5pjz693u sy aeivg 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 x99kdf is7:az(gz d)u/2myyjnon-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 electric field in this regi 9dy/2j(z7d:)gy9k zfa sxuimon of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is releas,q8-i9 spego yq tlb9;ed 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 ma-9g,eo9i;lbqs8y qt p gnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 to the horl.clo g,chv;9sds /-bizontal 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 field, which best describes the direction of the resulting magnetic fosl.g,;s v lc-9odbch/rce on the electron?

  11.29: An electron moves with s(qx2m;:0+vqmq3 i k1 wwqgg l4)sxdyr peed $1.00× 10^3\: m/s$ 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 − hgayta(1 z4p.jj)v )dbjgt2+ 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. +(.zgth2j a4))bpjtj vdg1ya 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 field B te 0+6qeaf p 13ao h:+mu+nhbland is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchao+taea3f01 ehqu n : mpl+6bh+nged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a ci8 .svyer9 - t os-cp1:ny mjin*fe:z,mrcular 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 .ezny vm imts en-s:r* of,9:81pcy-jthe speed of the helium to the speed of the proton?

  10.43: Two ions travix,z fv 83x3eh-po 0niel perpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in thizpovxie 3-x0fh ,83n e magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively chr63sg 8yrm(hnw+ d(rharged particle moves to the right. It enters a region of space in which there is an electric field dirdg6rr y8hh+m3( (swrnected 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 andy7 *jgls/j n t1,tnzw;mh 50ih 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 iswxg /3f08 zec,p0a49bzvseaz commonly determined bwz3, 9pz4aeb0g 8/ea xzsc0fvy

  09.27: A proton moves straight up the plane of this page into a r co++wwl 80 t0h0wyngzegion that has a magnetic field zo ht+wg cw0l00n8wy+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 m72vvuvy.-uxlg- ki 6z ,yr5 -km(fs wgoves 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 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 rryu-xsu(l ,v yzkkmw.i g65 7f2 -vv-gegions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with:5leeyvn . q xf59eu9k constant velocity through a region of space containing9l ee.xyq5nue:9 kf 5v 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 velocitt9 qebr (-af6z9lelu 0y directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are rqzf (-e beua9llt609in 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.