09.18: A wire has a conventional currejb4vjjs201s h8 finl8nt I directed to the right. At the instant shown in the figure, an electron has a vsij8nj8shjl1 f 2b 40velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which5pnk k08tvp8xvcy 9 0d ke9cv44a(0 svoz;iuy choice best describes the direction of the magnetic field at the point P located directly abovev0tkv(pu ka nie49kdxy 8zv9 o50 y vc08s4;cp the center of the magnet?

  11.34: A wire lies in the plane of the page with cz)e+tu8ydq,g onventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moviyzgd 8u ,q)et+ng directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving towan b(ip..qqyr1i13vxj1 pw( ggrd the top of the page at the instant shown, what 3vw1pg(b.inp j y1(1qg.riqx is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long strai x86mtoxcjn(ga ). 2ic /zn.s7alnq;rght wire flows in the upward direct6n28z7 ngax)cis.a/x tjom (nr;. qcl ion 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 proton is:

  95.16: A charged particle w9fbp:0pqg5 x9)g htrp mqx)c4ith constant speed enters a uniform magnetic field whose direction is:pq)9r9)pgx4mtxbp 5fg 0 cqh perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform ma d0 d/jwi6c6aqgnetic field whose direction is parallelqcd6 6da j0iw/ to the particle’s velocity. The particle will

  03.34: A positively charged particle of ygwte2 lgxd5+ylx.e206oun/ mass M is at rest on a table. A non- zero electric fie05nxol .u+ylw6e2gx g 2 /eytdld 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-zero velocity k +4z1,;l,tcvgpxnynin 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 oc+4gxt;k,z,n v1 ylp nf the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is reltmch9f/ e2u r9ccpiu59qq (bthu;hn:6mx l 22eased from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the cq6299q 2l/m(u; hcrebf: h2txtpiucc 59hu nmharge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angn3rc i(u ou4b.le of 300 to the horizontal enters a region with a 3c.i4bunor u(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 force on the electron?

  11.29: An electron moves with speed s czk -+cw-phy*5uxf ($1.00× 10^3\: m/s$ 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 q2go vg,,reg7r( g)z ptravels at 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 magneq ,7 e)g2o,pg g(grzrvtic force on the electron in this time?

  97.28: An ion with charge q, mass m, a f 9onux, 5c w(8ttt2(yloy+cbnd speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v,9,coxnb2to ttl w(+uy5 y(c f8 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 a3(u6aitfsca e/q ,;c uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle exa6i,/(aecu3t a s;qfc periences 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. The icge:l1u: ef/t-ty-iti/p2s0ti h we1ons carry thel0p-w f 21eh/ti egy/t:-tuiitces1 : 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 charged particle moves to the right2u1 euc8;hcc+ml9ass . It enters a region of space in which there is an electric field directed up th+l ;c9ecsm12s 8cu uahe 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 and ky/ 5;c5aun0vmau2xw uinetic 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;zwnz +0z pe06eq/xt8 dxz:pc)lc8rp is commonly determined bynx+z0c le/q6 8pdxp8rzwcz 0pe:t z);

  09.27: A proton moves straight fc kshro s +rk 8ai3-.j5jwnrm/1a4js 7/u ;urup the plane of this page into 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 of7r /4fkr-8 iuk jr3 /.;jsmo1uarc5+ swhsnaj electric field? Ignore gravity.

  08.36: An electron moves in the plan v tgbe y5:apdpy+w-.8e 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 magneti5.ayedgpwv y+8: t-pb c field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge movev*,sz qww d7fc; q.-yq dmq2*ws with constant velocity through a region of space con2mq7.zw; s,*v q qyc-wdwq*fdtaining 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 directly betweeu rg2,gnyhk yroo(5 5dj:5 rl(n two long straight wires. The conventional current in r( ,ojl5g 2yyg:(hk5roun5d reach 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.