09.18: A wire has a conventional curre mr(rbpb04g4ent 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 eleer bp4rb m0(4gctron at this instant is

  14.24: For the bar magnet shown in the fig 8fpoyo;2qt ld:kd-o g1/ y3fkure, which choice best describes the direction of the magnetic field at the point P located directly abovek8tyo/o3:-y 1qogdd2 f;l kpf the center of the magnet?

  11.34: A wire lies in the plane of the page with conventu7 yq jq15dks,ional current I shown. At the instant shown, what is the direct j1k7d q5us,qyion of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left iw37yc3,oxtd 8q5 ph yq(pzewa+k8fq* n a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic fwwtp8ezy(cqx*ha q3kyf o38+5 p 7,qdorce on the proton?

  94.30: The conventional current I in a long straifeu;zxb f3+u (ght wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a deff; b+(3 uuxzistance 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 uniform3t3ewth:0hu2x3ksvtz;yc4 w3y a-fi magnetic field whose direction is perpendicular to the particle’s velocity. The partf0uhyw3v t 2i34a;3kzh:wexts tc3 y-icle will:

  98.10: A charged particle with constant velocity enters a uniform+pr /lo jsso9g3+x )n3 oha,qy magnetic field whose direction is parallel to the ppxrl jh/ns+y9+qs)o,3ooga 3article’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A nk.nx6azwj qc+a*0xu .on- zero electric field E is directed into th wuk 0q.zxc *xa6j+a.ne 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 nv.j x+mzau 4* th+n4ywon-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves dir z unm4aj+*hvwy +4.txectly up the 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 negligible we -l3 ,uh7auk.epq dcugy3tq )86uwtj )ight is released from rest between the poles of a hor,gqd-u)y 3j 76ut)aqhukt e l.3wuc8 pseshoe 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 pl-nqfl0e ;i yl*ane of the page 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 ilenf ql*-yi0 ;nstant 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 speedf (e:/ t* 0cwjsrt1fwo $1.00× 10^3\: m/s$ 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 in a 2lv;vi,rk04 lg z 3k.6fpdxkd jk;0qfplane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radiuj40 k3kfkdlkrxz2; 6;qi v,glpd f.v0s 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 cha xw*f2mm2n*f 5 umsscv3.f4wt rge q, mass m, and speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion h4w .uw22n*sv*ms5 f tf3mcfmx as speed 2v, while m, q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves gi /lg4 n5v7qtgu86ylin a circular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magneticiy 57 u68gql/ngvgt l4 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 usp 7 qlyncq15.niform magnetic field. The ions carry the same charge and have the same path radius in the magnetic fieldl57 n1pcq .yqs. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. Iws0afj6m3 )nfb4pg a5t enters a region of space in which there is an electjaab4gwf6 5sm) p30 nfric 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?

  96.40: A proton of mass M and k7hu q:c 96v*sirip-y ninetic 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 4:mm*rb1a1ea h66 l;k f45zh loaptot 3)pof rcommonly determined b6f;46ao a5rpth 1a4k *le lopbt3zfrh)o:m m1y

  09.27: A proton moves straight up the.f( s5qvatd/v5wpn emt0(c d *7 buo:x 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 t t xnd50vqe f:c.s57wa*m/t(v o(pbdu here be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of th.chxuxga7,85w a+ pu ge 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 magnetic fi xc,agx.wau8 h+7gp u5eld in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a r 0ajdn+lk 7 xzd-an0.d d,ska9egion of space co,d 0+lk7sddx- aznja. ank0d 9ntaining 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 cons3+6(ce ju ,cxxbb;hw2*ofcwx +jl;f ttant 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 t3 ;fjow(ce cbwj *xcu2++6 ;x,lfxhbthe 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.