09.18: A wire has a conventional cur51x5 vve + zhxs)hv(tlrent I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the lef 1+( vts5l hx)ve5xvzht. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describess5uh4j v aq/ahfumr te(v1,;, the directiovuhf,1(ej q4ua r /mahs t,5;vn 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 pagne3k /anqj32k e with conventional current I shown. At the instant shown, what is the direction of the magnetic force on tha q 3neknjk23/e electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to wme4 r6qums d g,fsu w305km/(the left in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the/wm43 ew(uskqgu0fm, m56s rd direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upward di6)pl0plc49c4r;zc0 cmebsms s7 yza6 rection as shown in the figure. (r 9l bpzc)cmpe 0a ;cs4m7c04slz66ys 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 magnetic fie)cnfmtix*+ z+ m ,sjt6ld whose direction is perpendicular to the particle’s velocityz*tnm)++tj6msc ,fix . The particle will:

  98.10: A charged particle with constant velocity enters lvzx 9, 0l:u.w:a-xfhb,tdb za uniform magnetic field whose direction is parallel to the par,- 9hbadzxz 0b.:w lt,lx:f vuticle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A nonlen3 .8m3lu 5ji mv0os- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of the plane of the ta.mo lelnj3su 38m5v0i ble. 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 nfi:hf 0 7,k3y hndudg:on-zero 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 direc3f:fd, u:0nhi hydk7gtion of the electric field in this region of space? Ignore gravity

  04.14: A positive electric 5fzbq 67c7ru d ig8f+bh,av1dcharge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge c+,v8udraifc b 17zq5 d 6hgfb7aused by the magnetic field?

  10.26: An electron movig/w3dxts2z)w ng 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 plaxwswt/2) zdg3ne 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 electron?

  11.29: An electron moves with sndc4*q/m 9d jda:p/, g .8xrauog9ixbpeed $1.00× 10^3\: m/s$ 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 trave. 4y,xpd6)jndti(7t o1t7ln 1i l cjavls 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 amount of work done by the magnetic force yt )it7p11(7 jdd 4vl6an,.nlxtoji con the electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magneti,c/ c dwy(adf7c 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 unchangedywcd ( f/dc,7a, what will be the radius of the second ion’s path?

  16.44: A proton moveb/3 h sr3f3aeus in 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 is the ratio of the spea hs3efu 33/rbed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to theiu/k;v 7 nz/dn t )fcamq;(o9v same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same fo ;/tn 9n;v dfz)cm ouakvi7q/(r the two ions?

  02.15: A positively charged (xbaa m jz23nbon;;e:particle 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 a(n3ez b2m bj;n:xo a;maintains a constant velocity?

  96.40: A proton of mass M and kinetin1(vf +k +rmbx0ps3 vxc 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 i bb/3f/ rq-xfls commonly determined byrq-b /3/flfbx

  09.27: A proton moves straight up the plane of this page into a region that has h37)s)v/ctmdvy eqq qe.2 9ip a magnetic field directed to the right. If the particle is undef q q 2)9hptcq37emdi/e.vv)yslected 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 spaae.umb*;- p cft0z2it ce alongu*-p f0ta2mcz ib;t. e 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 magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velt5x(us a1l e2zocity through a region of space cuz 1x 5t(als2eontaining 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-z2zhz7rzxi) e9 bcwvi,hbj -)0 5k2ulfero 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 direction of the electric field that exist at the lof9b zikbc)wr e0 vxjh,2i2- )zh z57lucation of the electron? Any electric field in the region originates from an unseen external source.