09.18: A wire has a conventional current I directed to the right. At the instan0-ywh)1 y 4hh:zjos irt shown in the figure, an -1:)r 4yhjwi0 zhyhso 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 best descri+(mal xwos 5-u2.6cnrd5s mkjbes the direction of the magnetic field at the pointo r-ajl m5dn6m x5suc+(s.2kw P located directly above the center of the magnet?

  11.34: A wire lies in the plane of th8 y;8ogswyb yam5d37x e page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directl85m 7b 3d8aoyw;yx sgyy to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the protonnk2p w: hl3,ay moving toward the top of the page at the instantk phaw:ynl ,23 shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a lonam30 bsjzyf 2f+bc9 eq,- yj2pg straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a pro, j22 +3b0cfq -jmby9pseaf zyton 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 vveyr o.q9/g899ys c.uqu3/ / enur lsspeed enters a uniform magnetic field whose direction is perpendicular to the particle’s veloyns g/3.el9u u c9es/r/8 qyuv rvq9.ocity. The particle will:

  98.10: A charged particle ui(m) l h+k(auw1p;ibwith constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s ve ki;h(wu+a mi l1pb()ulocity. The particle will

  03.34: A positively charged particle of mass M is at rest on ezp-iq3l 8jy 3a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic 3 iej z8-y3lpqfield 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-ze)q7 i2 18ai hu tvsiu3bpu3o-sro 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 th)uto3uq7b ip- 8ihs2ui13s vae electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from resthcax+wv;ds0xvf-3rt ol: , u/ between the poles of a horses3:dfw/ots ,xvr;xclh +0a -uv hoe magnet as shown. 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 page at an angle of 300 to the-t;1s f9m v:fzji gdyo4r(;ib 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 field, which best describes the direction of the resulting magnetic force offiovd4 t(9mri;s zg:;1yj- b n the electron?

  11.29: An electron moves with* p.kvn5pakv1m,* s2hc4yv. y yc/ceb 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 at a speed v ie vbpi3c-mp01 n 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 magnetic force on the electron in thip0b13c ie-pmvs time?

  97.28: An ion with charge q, mass m, and speeddqwvkc w:y8p9xo+/ f 5 v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed+q9vf5cx/w 8:ywpok d 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 circu*j/ad88n w)iim+bj 0 c0 a mki7zrgoz8lar 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 durim*j 88c w /ao07rn+zkigiz0a jdm8b) ing 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 magnetiev4 ob0v*iok l/r8p v6c25dxqf1 vb8hc field. The ions 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 tw d02ihc1erxkp vv bvq8*vfo 65b4/ol8o ions?

  02.15: A positively charged particle moves to the rvc4+e8ws .49eqvx6ebvzc w e2ight. It enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction does 64e.xqv ze49cwbv2v+esce8w 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 kiner zv r2w(9w+) trt5zdmtic 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 dgs(d3ik*jla 3:zk,gparticles is commonly determined by(gzl g:*3kadi ks3d j,

  09.27: A proton moves straight up the plane of this page into a q jgvi8),z u)dregion 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 grazg8v)uji ), qdvity.

  08.36: An electron moves in the plm)3wvz-uo8e w ane 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 fiel w )-3oez8wvumd 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 constant velocity through rz3jc4kw- 1tl2gxi 37.n o gtaa region of space containirjg41x7ot2lact3iw 3-nz kg.ng 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 cznhu-w,5h h h/onstant non-zero velocity directly 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 best reflects the direction o h-uz h/h5,hnwf 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.