09.18: A wire has a ,gi-qbuw:z3nz5q8uc06;v nij wbe1 cconventional current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the5u8gqbw6wqz3i0 c u , i1n:vnj;z-cbe left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in tqmt)lrpnw.2 hhy12i 0v 7j+syhe figure, which choice best describes the directi m ph.hl70q ry2t v)wsyn+1j2ion of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies inc- a0wbe6p(h k the plane of the page with conventional current I shown. At the instant shown, what is the direction of thekh(-w ec a0pb6 magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to m2aza8exm76;bifz )ro( 5xrlg1 iiw ,atq c0,the left in 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 force on th;e7,t2 xam b),ixz(im8 ar1l 0gw6 zorqca5fi e proton?

  94.30: The conventional c,k*6z.qofdur *fs4dpiu2a8c urrent I in a long straight wire flows in the upward diruozd f2,d us a .q*prck84i6*fection 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 s6yf*-w t bg)h(p .qxavxo*p n;peed enters a uniform magnetic field whose direction is perpendicular to the particle’s ve hngax;o-bpqpt (x*v*wf 6.y)locity. The particle will:

  98.10: A charged particle with constant velocituo mk;tb f f+sq0cy)1k6oan(9y enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particle wi1oof us +c0takk(6 qybf)mn9; ll

  03.34: A positively charged particle of mass M is at rest on acy2m ix5(vu6bh ryr 9m.qz-y3 table. A non- zero electric field E is diryqyyu2xch5 rzr. 6bim 9- v3m(ected 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 sp bhpq *2/t9dfgace that has a uniform magnetic fieldhf d/pbqg2 *t9 directed into the plane of the page. The proton moves 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 netwoo 3j hdl *r)x+,kh,l(co( qgligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the chat+lo)wl(d(crok3xo, h q* j,h rge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 to the jjpt1bn.x s8)d*z;kb 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 e*bnj;8z tpb jd.sk)1 xnters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron move onza wb5fz0xvjg*dm7famq(3 )bvd3 .z::h t 6s 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 i+ fi74k7lufev in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radi+e7lff4ii k7uus 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 sp( de6. : 57mmwrjxz0x a7bngtxeed v enters 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 arex0xn7brgt:jxm mad(z 5.7we6 unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic field 7hp,l6d;zpg.g tbz+ f B. A helium nucleus moves 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 tpf+gz ,;zlpd.h 6b7tghe helium to the speed of the proton?

  10.43: Two ions travel perpendicu up2q +6w3jrv8bc2 chhlar to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the r vw2+chjb2ucq68ph3 following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enl) 1.8zlj pjrm83d-zley f /p-(drqnwters 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 fie)qdp er13lz( m8f-prn.jjd y/wl z8l-ld have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass Mnw7 1fqr 0f s2-sk5xus 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 determined o9 :)hc/i:y x--yfrgq4c pp woz1w6o tby /-qtc wgc 4)z-9o6yhopxyi1f:r pow:

  09.27: A proton moves straight up the plane of this page into a region :/juevs p6c 2;00 9qvgsnzd zxthat has a magnetic field directed to the right. If the particle is und q;zxndzv0 g 9/js2e :6sp0vcueflected 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 page throur q/w5gx2t5: 7 d.dnl6xposimgh 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 magneticgdmi7 r.q s:/5lxop t6x5nd2 w field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with mt 0e tj v7// 4que1j3jehad9kconstant velocity through a region of space containing0amde9j/q4 tj1hvt / e3uek j7 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(dnp jt)b w 1(cp k7g6jtbd/1mnstant 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 dw /)g1(bd6dt71tbpjc(pmkjn irections 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 electron? Any electric field in the region originates from an unseen external source.