09.18: A wire has a conventional current I directed t g)d,+ yp,.u ibh-vya hy2mymu4v0xexh+s/ /bo the right. At the instant shown in the figure, an electron has a . udmxae-x 2uigv / y0 +ys4 )hpyb/+v,ybm,hhvelocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which yd c z+.ph;hw1choice best describes the direc whp+1y.h dzc;tion of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional cur kbaq j60wyks2h0 (6-:z dlvtdrent I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wir20t0l-jw ys( h6 bk:d akqv6dze?

  13.30: Electrons flow to the left in a wire as shown. For the proton movjdn- -r3yfrn8ing toward the top of the page at the instant - d rn-jn8yfr3shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a loamkrc1o83x p9j *jh- cng straight 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 distancjxkp8m3 *9c-o ahrc1 je R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particlelgz:mklst +:ht (.0w h with constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. +kwh h ltmsg.t0(:l:z The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetinj2 81 auayf4(s)4dxbra vio8 c field whose 8boxadjv8rus)a 44y(1ifa n2 direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rym0mggyt+ y5h*07qgl g( fr5hest 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 g+fym m gqy(hy tgh* g075r5l0plane 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 veloc1i7ny 9m(nbrjity 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 (bm i1jny9r7n direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of ne ba26g+j/haz wjd/ gj+gligible weight is released from rest between the poles of a horseshoe magnet as shownw6/+jb agj/j g 2zdha+. 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 t85xi)- hb5-n)gom14hteg rc d9p2bn-nes d qzhe 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 m)-de9bn2tr55 ihp g)1n-dze4 go8 x hqsn-mcbagnetic force on the electron?

  11.29: An electron mofy1 u fr3jm,j7ves 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 muxtv ; o/ r guels,l6gnvk ,,+1k2e7gb 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 electe/nu7 kegv6 l ; l,+2bxgs,g1okuv,trron 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 spe jb21j3c;gqdy a:5eq i w-n8xeed v enters a magnetic field B and is deflected ij3w nq;58qijc g2y1-dxebe a:nto 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 ion’s path?

  16.44: A proton moves in a circular orbit iuha0va7 l a(a;n a uniform magnetic field B. A helium nucleus moves in a circuaa0v; a la(hu7lar 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 helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the s s-jz j6qwm*b5ame uniform magnetic field. The ions carry the same charge 6 qjwbs -*j5zmand 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 pzqvjp73: 2 ffkarticle moves to the 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 direction does a magnetic field have to point in this region so that the particle maintains a c7p2zq 3jff kv:onstant velocity?

  96.40: A proton of mass M and d2;-nrq cq e/ v;ek1s n4ui 2jl1ce1orkinetic 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 determinedcspw8e26pmty0- 4gfu 6(ogsp byfo66 - p4(uyscg2m0tgs pw8 ep

  09.27: A proton moves straighm2gvdui c69z/ )w *d/qykk )st1r0jbkt up the plane of this page into a region that has a magnetic field directed to the right. If the partic0v1*)gtkiud2 k zb/ jdqk yrc/w9m6s )le 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 page through two regions of space90 thj6jvswq. along the dotted-line trajectory shown in thj 9v.wqth6 j0se 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 charg8ip )0jiryw8 2,rqzqf e moves with constant velocity through a region of space containing bo q)rfr0j,8 qiiwy8p2zth 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 mmqq3xr*l . cv6oves at constant 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, which choice best reflects the direction of the magnetic field and the dixrv *.lqm 36cqrection of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.