09.18: A wire has a conventional current I directed to the right. At thc. n8-uqp 91umt6ypoyf e6rd ,z*fd e)e instant shown in the figure, an electron has a veloci1uyc.edet f9qo rppd 6m 68-z)*,yfnuty directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the fieap3abgrh1e )/ 7au c-gure, which choice best describes the direction of the magnetic field at the point P located directly abov rpeu-3bg/ce7a1 haa)e the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional currenufwrz3+0 r) (dwvhhm6t I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?hdfu(m3z)6 +rr0 h wvw

  13.30: Electrons flow to the left ip2pdsdp, 3eyss2 10z gn a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the esd2p s0p2sdg1y,3p zmagnetic force on the proton?

  94.30: The conventional current I in a long straight wire floib0 p637oxe(b fi4 haows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance Rpfx7boii( 3 h0o b64ea from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters 06kz.t. bx3xe9ci h fla uniform magnetic field whose direction is perpendicular to the partic6tlhzc 9f.0e kxx.bi3le’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform maq/qkur0duq q ea-x1e g7y1;f;gnetic field whose direction is parallel to th;k0eq1y;7r-uua e dxq gf q/q1e particle’s velocity. The particle will

  03.34: A positively charged particle of masjwetc iy+oy0iwg5ko(21 2,uhs M is at rest on a table. A 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 abou io2c+ 5g yho,t1ewy0kw(ui2jt 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 l,c bhc376k8 xdybi p18p6ouz 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 elecpcdy66o7 3kxlz,18u8bb i p chtric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight isqixz .z4l)/ vt released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the z4qzi t vx/.l)acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of ther c+ 8zx,lx*oi page at an angle of 300 to the horizontal enters a region with a constant magnetic fielir8x, x+zl* ocd 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 speevb97qz o.b b/5zcn4 1ko hgloiq1)a0w d $1.00× 10^3\: m/s$ 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 chargzsn56 u0kz h:oe −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. In a time t, the electron travels halfway around the circle. What is the amo:5ukhzz 0 ons6unt 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 acy:1bzir*n ;m magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, 1mi* nb:zyc r;q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circew 3b/ nbsv97.,-i8vigizs +jcj 4 eurular orbit in a uniform magnetic field B. A helium nucleus moves -s3cs7b/i i+z.ebvnju,r9ew4g ijv8 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 the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic fieryln.7 ehpy a.,t;x1f ld. The ions carry the same charge and ha lyn;r.fe,xpht a .17yve 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 movd)d h g o yyuakn89/9)fl(ndn14eydq ,es to the right. 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 a magnetic field have to point in this region so that the particle mainth()9d/uyyf,o4 9da d gnnd1kyn)lq8eains a constant velocity?

  96.40: A proton of mas )iw;nm6s5.v f0qqfjhs 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 deter*+/xh7pcqyj)b +(kb u4pnflwp n 3a4 rmined by+b 7 flc4u()jahp*bn4xqnp/ywk+3rp

  09.27: A proton moves straight up the plane of this page into a regior4:qoktk+ ;me e 6;xgzn 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 ofxmk4 ke;;t+ oqrzg6e: electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regio4ptt 6pl1 je,svr:; uyns of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directed into ut1,: lppj6tr e;vs4y 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 constant velocity f 9ckz*u8kfg8 jlz1-3n) -b-hgseso3 ep8ftr through a region of space containing ef ztrgb nsf)g u-k38skf8*z-- 39lohp1 8jecboth 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 mom.2 bo-wsedqp ,3 jk:zves at constant 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 of the magnetic field and the direction of the electric field that exist at the loq-kp sd 32zwbm,jo. :ecation of the electron? Any electric field in the region originates from an unseen external source.