09.18: A wire has a conventional current I directed to the right. At the instar/cbnz44m+z ent shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at this inn/rbe cz z44+mstant is

  14.24: For the bar magnet shown in the figureexqu59 j( x.gl, which choice best describes the direction of the magnetic field at the point95jq u eg.xx(l P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I show21nnsp g my9.kn. At the instant shown, what is the direction of the magnetic force on the electron that is ynk 9gns1.pm2moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving 4 rx+ ::d(rrv7 j6tjzgqmw:altoward the t(j7 rr+g:dx:: j6vr t4azwqm lop of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in 1 q)u m2jeeqtgs05 (zbthe upward di0(2b1u jesqq) g metz5rection as shown in the figure. (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 enypvuxttks q/24v( .zct-g.c) ters a uniform magnetic field whose direction is perpendi xpg.-qut4cv yst k tvz.(/c)2cular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity p jx ;vyq.dgx:: d,8 t2klqnp8h /lw6benters a uniform magnetic field whose direpx nvdtk x,2hl8p b.;j/6dw8 q:: gylqction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at qi su ;/nl3k0drest on a table. A non- zero electric field E is directed int;l3/0 qskn iudo 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 vez2f2)kv +dyattub(d; locity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton my zbv+tau2(;2 kfd) dtoves directly 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 weight is released from restvdeyrl98 )k )a between the poles of a horseshoe magnet as shown. What would be the direction of therdevl8ya 9)k) acceleration of the charge caused by the magnetic field?

  10.26: An electron m485q0pcae fd goving in the plane 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 instant that the electron enters the magnetic field, which best describes the direction of the resulting magnetic force 8d 5cpq ag4f0eon the electron?

  11.29: An electron moves with s gzm56sg:8 pr x7f0gky,w, ysopeed $1.00× 10^3\: m/s$ 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 atnw g 2g 7+,z;l6ckaiat a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular paaa;lgnc t27z+w6kgi, th 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 6zdhn/u7wz (aenters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchanged, what will be the radius of the second z 7 dz6(a/wnuhion’s path?

  16.44: A proton moves in a circular orbit in a unifxz+ygtiicq9 -za2yk95+us 4 oorm magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each partiqu 52yzk ix+9coi+g-ty saz49cle 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 tocc.q bt :*lnw 5nqwt- .s1pvu) the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantitiesw b tuc1:v tqn.w5.n-c lsq*p) must be the same for the two ions?

  02.15: A positively charged particle moves to ttfqr*dn r0 5c.d/4 xkiid(.qc he 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 direi*xcq(.td5n4/d qdr kci. r0f ction 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 p7ud szmcm-g+x 6 6dogat 6xe5dvz:62and 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 electr3m, *b7cffhwls y:y +tically charged beta particles is commonly determined b:tw f*s7mfc byy3 ,h+ly

  09.27: A proton moves stoj.,dua-rg s9t+1h5o4x 8z . z xz5(pzrbczjpraight up the plane of this page into a region that has a magnetic field direct5p+.zz juc d.xst1oh -gz9o azz(b,5p jr r84xed 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 gravity.

  08.36: An electron moves in the plane of the psiqg x79 7dr 78hpt.p5zkss0page through two regions of space along thegp7k9tp 8 shzsd.s05xp7 rq7i 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 field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a regionmy2y- +ke2xriz z1+n2w uag 4q of space containing both an yge4w2 myq+zi2x-2+ukza 1r n
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 directly betwea( pak1kaq(* zen 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 (pkz akq*(1a aof the electron? Any electric field in the region originates from an unseen external source.