09.18: A wire has a con oncss* ixc(x-so .gsyy6*24 nventional current 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 electron at 2nssi 4cc x ng(6o*syo.xs*y-this instant is

  14.24: For the bar magnet shown in the figure, which choice best describbn0:0ot h7m ofes the direction of the magnetic field at the point P located directly abo:7 mobthn0f0ove the center of the magnet?

  11.34: A wire lies in the plane of the page with convenz uu. +le-xhev vbj6,v 1ps9z,tional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly tvv zlb seeh-1+j.pu9z,xv ,6 uo the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moqm0*ssg j/ eo,ving towarg/m * seso,0jqd the top 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 the upward nnj8u5r0rf6k 1*oo e5ejx q dd;vna19 direction as shown in the figure. (Electrne50j 9nr;onudfak j q1v8e *x1do5 6ron 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 magnetic fit u+ ;ppr.ovk- nca4 w0i wbzpt23ts*4eld whose direction is perpendicular to theu+sz.-t4oc0*t ar4 p2b ppv 3 nwt;kiw particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform *p6umwx y 4zl2magnetic field whose direction is parallel to the particlewz6*pumx l y42’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest o igpu (e6uzh7*n a table. A non- zero electric field E i *u6ihpu zg7(es directed 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 oxu a+9)rj:bqif space that has a uni+bjr)qaxu 9i :form 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 gravity

  04.14: A positive electric charge of negligible weight is released from rere g7ngh6q.lpja:0 .d st between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?:.g eq rg dn7ha6lj.p0

  10.26: An electron moving in bd lm(*k-xonq*jh :fo0 p.v ld h(tg;5the 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 on the elec *o pg;qm ldt-5bl fh.nvkj((h*:0 dxotron?

  11.29: An electron mooe9w l(ojp 5g,:gyp a0ves 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 mrt ) gohe 3:wmlc2b*)rass m travels at a speed v in a plane perpendicular to t)bgroe w rc:) h3*ml2a 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 amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speev*9c-c -v+vq+ lnvoio)h *d3chp yny .d 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 are unchanged, what will be the radius of the second ion’s paidyhl*qc vo+v-*n3o-c . cn)h+y v9pv th?

  16.44: A proton moves inem ,c*9,ebu hi a circular orbit in a 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 *hc 9eu,i,mbeis the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendi1db m:4swg.omcular to the same uniform magnetic field. The ions carry the same charge and have the sawo4sm.:g1 d bmme 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 regirn3z1e jp2 z tv73(w ysbse6;aon 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 constantay1n36s3e;z7s(r zbv2 tpe wj velocity?

  96.40: A proton of mass M and kin0qcz 6/ogodx : x*z.qvetic 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 bj-65* o7fur ll nujv,iy5 ljo6-* jiufl,n 7ruv

  09.27: A proton moves straight up the plane of this pageau4bhz(8 hn 7mz4-to6f vwnx) 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 therut )nn4foa6hzhxbwm- 8v z7(4e be a component of electric field? Ignore gravity.

  08.36: An electron moves inbi9f gb;ec3po h1o,a( the plane of the 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). Thero, 1 eb;o(3caigf9bhp e 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 cons r4o-xdcv) wo90 r.ewdl+ u1ectant velocity through a region of space containing both ad-)rw+wo 01uoe.xe rcvdl c94n
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 betwee dwtqn1bd(f: a vc1mnqz*w.54 n two long ddz4nq w:qt( bw nc .f5v*11amstraight 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 in the region originates from an unseen external source.