09.18: A wire has a conventional current I directed to the rub1 e( hfpa92 +z*rkyiight. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the yui ha p29rk1* f(be+zelectron at this instant is

  14.24: For the bar magnet shown in the figurb q,xui5k)a-o n :/zfje, which choice best describes the direction azx o5n: fb )k,-/jqiuof the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with g8sd2 q3btr 4f2r3tns*hpz da6m5r+ghn(m *i conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that6db ta*rihmm 3 gg3tnz f(dp2hs8+q4 r2r*5 ns is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the d1g9wg2 a: u/mqg of*vproton moving toward the top of the page at the instan1fa:2 *ugw ogdvmgq9/t shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight (0esa7:/2xa 6bbh vfx b7c0itxk1myowire flows in the upward direction as shown in the figure. (cb kxbh1x y07/6 7 sem:b2ata0xivfo( 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 with constant speed enters a uniform magnetic field whunv57n(aso :f(f scc0a, crvoon.1 a:ose direction is perpendicular to the particle’s veloanvs nnc0:coa71 va:,frfoso5. (uc(city. The particle will:

  98.10: A charged particle with constant vew/87 2;aiy(lmsqph rs locity enters a uniform magnetic field whose direction is parallel to tw2rsmy l apqs(;i/h87he particle’s velocity. The particle will

  03.34: A positively charged particle of mass q+osy0 jp6hn1z, )w fhM is at rest on a table. A non- zero electri6spnz )hoqh1,+w0 yjf c 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 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 in a region of spaced l8.bkoz mjp eb)3+(h5yuy.g that has a uniform magnetic field directed into the plane of the page. The proton moves directly up tl ubygmby).3.+kohj 5(8 pz edhe plane of the page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligibleyh po4d2ej8 +i weight is released from rest bet+8oy4hdi2 p jeween the poles of a horseshoe 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 the60p4n5bsevd 1 k bpfvm4 n6plw 28d5pb8u; han 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 k 8;6p6n5a0mnpvbw fpp n28hbu15 bd44dslve resulting magnetic force on the electron?

  11.29: An electron moves with sp 7 hl2tcf ft4p9zfakro7+g 5ciiul9 ;0eed $1.00× 10^3\: m/s$ 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 −h 8gjt 9 8e ;cstw18ym0x0t9x+v;soogm uxl6v e and mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electro1x o w;m;89g9vt+v shlotc688e0tjsu y0x xmgn 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, and speed v ent+p2urqja3h t ivf,.0g ers a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2af0 j,t.u23 vr+pihgq v, 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 magneuq6px mnqg 0o*y4 r1ot1p q-;z sme1v;tic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic force ;onr-qzq1m1mg p px u*ts;4o0y eq6v1during 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 unif)gqz 3.vf8o rr4rx7 v9mttq.horm magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be thrq37zgorvxqf4r.tv)89h . t me same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a region of 7csqk3 u3( bxnspace in which there is an electric field directed 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? 3(b7u xc 3ksnq

  96.40: A proton of mass r1w+v y1vhkp5 M and 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 commonly de s5/ gsp c;l(gq.ha;r,hxs3uetermined b( q5./ag c;xe r3slps;sguh, hy

  09.27: A proton moves straight up the plane /l(d .ebyu p-pof 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 of electric field? Ignore grav(de l/ pu-b.ypity.

  08.36: An electron movwd))hr;6vqjy fopx 4-es in the plane of the page through two regions of space along the dotted-q )v )6h fxo-prydw;j4line 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 consta4j+zmqyz e :tttoqw:z(*6 v sd8i./u tnt velocity through a region of space cmq*t +zdt :tzioy w64zj(eqvs/:u8. tontaining 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 dire+szm2nz4,go.ciy x , x mmj(8ictly 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 of the magnetic field and the direction of the electric field that exist at the location of the electr8go, xm n+mc.4,zjmi2 i(y zsxon? Any electric field in the region originates from an unseen external source.