09.18: A wire has a conventional current I directed to the right. Ag3m) go,t/a6.x o mt apf5d3eft the instant shown in the figure, an electron has a velogmog/6.tfodfx t5) a3m, 3aepcity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the ,0 gx mx4*fevwxhlc- o- gr1t/figure, which choice best describes the direction of the magnetic field at the point P located directly above the center of tghcx14,t-rx wf0*o/ g-xlme vhe magnet?

  11.34: A wire lies in q1zfbqxp/m9 6 0beyy;the plane of the page with conventional current I shown. At the instant shoybb9z0/61q qe py;fmxwn, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the p/o+b o5-si jmly0q;kc 3ln. zdvk88mi roton moving toward the top of the page at the instant sh-8m 05 mcz lq.liosi ob;k+ny3d8vkj/own, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire floqw4ir3d i76 sows in the upward dired o3i r46sqiw7ction 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 enters a uniform magnetit5 0oiu(x4cum c field whose direction is perpendicular to the particle’s velocity. The particle oc4mu0u i(tx5 will:

  98.10: A charged particle with constant velocity enters a uniform ma-ind-8;f bg3 ksf2wsr +ixz ogb98y;zgnetic field whose93+8;ky xb;gzzi--sf rwd2nfgi s b8o direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A nogerrwyv1(7+ jy9tdpd i6o4 /n n- zero electric field E is directed inty/e (wd69 rripdy 7got4+vn1jo 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-zerxx07 j9 /yocyao 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 the page. What is the direction of the electric field in this region of space? Ignore gravi7x9 cjya /xyo0ty

  04.14: A positive electric charge of neggi*w+)tpo:4rgf;+v 0dji 3htd 4x gidligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the accelera* 4pvrjxdt:;+ hd wfgd30t)oig i 4+igtion of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 to the hor-yrrq e5re) j o:oqbjuz/u8e2.:oj(d izontal 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 field2j8-jz )rybuo o e5uojrq:(r:.e/qed, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with spe579jkx zwno0ced $1.00× 10^3\: m/s$ 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 anso+i1,sv9myl* bqp0(/yt f ppd 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 amountpmf i q10s(l/sbvyo, t9p+p*y 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 nf b-e pz9)ax)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 willnx)e z9 af)p-b be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a) 8ma5zq fjhx*se(xh 3 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 force during its motion, what is the ratio of the speed of the heliumhqzm hxs a 5*(fe)3j8x to the speed of the proton?

  10.43: Two ions travel perpendicular tci) sh 3wqgs7:at4lp qye1k :mi02mk5o the same uniform magnetic field. The ions carry the samsk0h ei: salmpqk i:72wmy1c543) tqge charge and have 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 moves to the right. It enters a regio0 ssyj0x tifcw75;xu4 n of space in which x0w5y 40u i txssc;f7jthere 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 maintains a constant velocity?

  96.40: A proton of mass M an f-fz.j nwbb;4eyq q3/d 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 bedf.tdp.cms lk4n qb-1(:np:rta particles is commonly determined bp4m :bkq.s. nf-l1 ( dc:dntrpy

  09.27: A proton moves straight up the plane of this page into a region that ha 0 g19d3 axu xmv/ofg 34)w+gaght)bkos a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction must therewg)agk/g uxxh 3o 1vo) 9g t304dmbf+a be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two region9 zfw,s i /;s9not k;tjyvkokt.d86ig zd7)c4s of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I di 9ct)j6/nt4;wz;ig,s .8kikfdt7d z osy o9kv rected 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 regionlb b +a25,gy e yxt*t/c7akjw7 of space cont/tba2cl xbykg eta7*57,+jy waining 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 constant non-zero velocitylrife 7,1vi (q 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 location of the electron? Any electric field fiqi, v(7el1 rin the region originates from an unseen external source.