09.18: A wire has a conventional current I directed to the right. At the i 01q:gu c6moppnstant shown in the figure, an electron has a velocity directed to t p6q1mougp:0c he left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best d-(mnbt2gql4)q rcd - iescribes the direction of the (gmdlbt-2n i-)4q r cqmagnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page wiq7 y;4yan*z6o /qhzlcth conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving dira 647hz nc;qzlo*q y/yectly to the right toward the wire?

  13.30: Electrons flow to the l 5r2j(w1 yunonckl* j41ra 0jueft 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 mc05 (owu1j1rjk2ya4j* ur ln nagnetic force on the proton?

  94.30: The conventional current I in a long straight wipc) lyl8;(:r* becajsd9r*gsx ,v9ul (a 9xpbre flows in the upward direction as shown in the figure. (Electron flow is dojg c)*: ;(rblx9paxvdr l98sbul*(asp e9 y,cwnward.) 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 ei+4i(ujxh)bx - gtu8,r n xjm-nters a uniform magnetic field whose direction is perpendicular to the particle’s velbu ug (xt,xijhr+n) xm48j-- iocity. The particle will:

  98.10: A charged particle with fols4wuho(s ar9a,s e (rra-4l5n :y:constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. Tha a4yur :9f(4heos(ow rar -ssn:,ll5e particle will

  03.34: A positively charged particle of mjtf bxge07 bz:+, 3rvfex3 7voass M is at rest 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 plane of the te7f0,3v3 xgjoe:tx vz +bfrb7able. 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 velocitiw jyv;ppkxv v3m4w 1s2 4d)+xy 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 grawvi k;+4j w4x2md)3p vspvxy1vity

  04.14: A positive electric charge of negligible weight is released from rest b i5vz ru,;v:h3bq cg/jetween the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charghz ,cij/ r:5 q;vugv3be caused by the magnetic field?

  10.26: An electron moving tspasn mo6,dt/ 6e:1c/k7j d crgwl70in 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 plane of the page as shown. At the instant that the electron enters the magnetic field, which best describes thl:a70p c ,sst1/7w ckeddmt/6 ojn 6rge direction of the resulting magnetic force on the electron?

  11.29: An electron moves wy2y7cj*za:fjgf.p u2ith 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 traveluferg5 j a0:/as at a speed v in a plane perpendicular to a magnetic f0gu / :5frjeaaield 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 speed v ent75gsg 7a/j ccwers 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 twg7a/cs 7jc5g he second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic fielcra m03lcbiaa1.(o 0b d 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 1 .r bcab0(3ila ao0cmspeed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the sam h;dnz 6alg0w/rrn jr eufzb* 5/3v.9ee uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities mus6e; fbl*hez.z9n5wnu / jgrvarr/ d30t be the same for the two ions?

  02.15: A positively charged particlew5 l1riw:*9oy09cbfo cwo/fv 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 magne/or *ioywl1cf w05cv:b9o 9fw tic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic ener9biz6d :q c)w 1 nnffcu7mctn ny01a7-gy $E_k$ 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 +-m1 sva2vr habeta particles is commonly determined b aa+r -s12vvhmy

  09.27: A proton moves straight up the pc h)45spih 1akd 4rc2glane of this page into a region that has a magnetic field directed to the right. If the particle is c5p4i)hksd 12 4c hgarundeflected 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 p8jbi)94w 50q8 y p q wvz3bb:rubtx8jtwo 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 show9qw5zpr p 3b:w4)vbqit8j8 0y8 xubbj n). 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 v pwssqnq*.pm :hr, j9/elocity through a region of space containing bothpw9 qs:n.,s hjmqr/p* 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 velocity direc/a)jhq ue n4.ztly 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 in the region oenqu/j)h .z4a riginates from an unseen external source.