09.18: A wire has a conv 7c 2.m3ep7gexwk8pa kf/fbk i0h1d.dentional current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at this instant is 7x08/ cikae3f 7m1bp2d ..gfhpk we kd

  14.24: For the bar magnetwxt xy67qm93qhm;)a v shown in the figure, which choice best describes the direction of the magnetic fqtxq;7 w9mv)yhxma 36ield at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of ef-1w*alsr7 9yryl8a *fb-cw the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is mov a8-eyylc w r1flasr*w9fb-7*ing directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving fjyno2+ *eo3gsz- x5dgrk)x;h6/ wxo toward the top of the page at the instant shown, what is the direction of the magnetic force on the;dx6oh2kzg f os) g5 +3y*en rwjoxx-/ proton?

  94.30: The conventional current I in a long straight wire flows in the tw --) f vcxfmphl-v16upward direction as shown in the figure. (Electron flow is downward.) At thh-6vv 1 tfpc-m )-xwfle 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 jdw5g eit3(6; ijpyi )with constant speed enters a uniform magnetic field whose direction is perpendicular to theypd ij;je3 ( )wii56gt particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a unifrgep)ew2ocmqva *9 i4h( 0g3qorm magnetic field whose direction is parallel to thea(e0gc9ph3w rq4)im oeq*v2g particle’s velocity. The particle will

  03.34: A positively charged 57kw d5m 4(bk2 iw .jeel1xxv klar*g8particle of mass 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 about the magnitude of the elec b4 ev8(2lmjgk7xlxe. 5idkrk1w5 w* atric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves w jnpt0 bx1u2)nqvws m/l30jr/ith constant non-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 2 v1 jq /)nbtwn03xmr uj0ps/lthe page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from rest wuk871b- xs (k,agj2u43aiw je,cw ehbetween the poleujeu7k, ,a 1324ibw8xhjawwk( es-g cs 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 1;zya2g mg47 jagx xcpo3r 52jpage at an angle of 300 to the 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, whicg mgr 1xa2x2pz7a j5ojgc34y; h best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron movrhb(uvu:8w-d2spv/bo kk3 n5es with 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 ikd*rmaawd t 25s4/ 0/up5,agwvb h b4in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circulara p5u42vga hmww 4sid/bk/d0 *a5,trb 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 enters a magnetic field B ao77h:pr +bgcuttfb 72nd is deflected into a path with a radius of curvature R. If a second ion has speed 2v,r+7: 27 t7gbutbhp ofc 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 n+,sdnd gt4q*fu )ad k3i /sl0circular 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 f*atis04+ quk3n)ddn,f s g/dlorce 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 uniforki4udo(-36 +uxy qkycjv j-:im magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must3 4iyd+ujvyq6juk(x:ck --oi be the same for the two ions?

  02.15: A positively charged particle moves to the right. It entersud:7vnvey ;nuqed;l5 2 z6/bp 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 magnuluv:ep52nd7vbyd6/ qe ;z;netic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M ag 8kp qpoc/ 7y;rm-vp/ o;uhnda.st:)nd 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 iu(h4zftln /gn9-na4p fyl 28commonly determined by2-ahy/nziln9nfg4t pf8( ul4

  09.27: A proton moves straight upqf91o (*8+o 8bim jajp. eplpj 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 of electric fiel 1bjqjp p lo(pefj+a*i o98m.8d? Ignore gravity.

  08.36: An electron moves in the plane of the page through tw + )o .zem.21ebrjvllrl) *ysjo regions of space along the dotted-line trajectory shown ilve1). o ).bmje llzs2r+ jr*yn 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 constant velocity thrk q0+qd1w/nt rough a region of space w tdkq1nq+/0rcontaining 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 co:,4 pdquyr:o enstant 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,r:e:,qypuo 4d 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.