09.18: A wire has a conventional ;5qt eqy:r vj)current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetrev;) y5t jqq:ic force on the electron at this instant is

  14.24: For the bar magnet shown(.:yxhka 7m l:zane4n in the figure, which choice best describes the direction of the magnetic field at the point P located directly abohk. :na4m z7:n axely(ve the center of the magnet?

  11.34: A wire lies in the plane of the page with conventioe xm8e2mqca-5nal current I shown. At the instant shown, what is the direction of the magn2 q5-cem ex8maetic 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. Fo8-l we2f t:m hqe8srm6r the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the proton?le-882m :hw6me fr tqs

  94.30: The conventionalbgq78 - j 4dcum/fh ,rd5gpwy3,k.zfw current I in a long 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 distance R from the wire and head-fkfq8gp4 ruw5b,wdy z./3h7dm jg,c ing directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform magnetic fiel/7mu2x w : fxpb;omb6ld whose direction is perpendicular to the particle’s velocity. T:bbw7x6 f 2ol;x mmpu/he particle will:

  98.10: A charged particle with constant velocity enters a uniform magne0 u+/y ps;v /kkumta(atic field whose direction is parypkakma;t+ su/ /u(v0allel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mpmfoy;jb, fco; jr+ziu 15t- 5ass 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 m-;1j5fo;z+y,t cjo brpu f5 iplane 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 mt(9vd7-: mnfs)zxala wvq0 2fj4uy2vy 1ng2 constant non-zero velocity in a region of space that has a uniform magnetic field direct7fyz9:42q2nv -m sjv v wt0xy a(ugmd)nfl 1a2ed 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 releao)*x-w.e. x k xrly9vysed from rest between the poles of a horseshoe magnet as showyvr )*exxloy-w x 9..kn. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron movint uuyric77vsb (xmy -(x ;c3x:g in the plane of the page at an angle of 300 to the horizontal enters a rc(r x:xmt-uv7bxy;c 3 u(isy7 egion 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 electron?

  11.29: An electron moves,9xrzs. eacf1 *yv, rs 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 m travels at a speed v in a pl8 b0es4;ln;lxx + eruxr l-0zaane perpendicular to a magnetic field of magnitude B. The electron follows a xzlr0enux4a0+lxr se-;l8b; 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 :62ybbal4 fb-na kiw 5q, mass m, and speed 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,f aak6w n:2-bl5i4byb and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uni oh8r wn6i-.pnform 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 of68.orhn- wi pn the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the sam*amr/a . qgz- oy6cu1 :/njaxse uniform magnetic field. The ions carry the same charge and have the same p*- qs/c:ayxmn61 .zo aj/agurath 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 rig lx9/kk-xohi ;ht. It enters a region of space in which there is an electric field directed up the plane of the paper (sexoh l k-xk/;i9e 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 and kinetic enerr8j. hzwe9bf+ 1 u gmu6cmpo-0gy $E_k$ 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 elect k1l :u76ljkburically charged beta particles is commonly determined bj1buk l6kul: 7y

  09.27: A proton moves straight up the plane of this page u 5d. z(4h ragu3hy dva53/ivcinto a region that has a magnetic field directed to the right. If the partid rz(vay hua43g5ucv/ i5d3h. cle 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 tzfpjaoj/ jy; h89n1: 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). There is no electric field inyj ;n1/f tahjp:8j9oz Region II. What is a necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge movef*y0ykebw:/zs.z x v.s with constant velocity through a region of space containing bothf .wv:*zybxy.e 0skz/ 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 ve z2-ht +,x*:p/vg )e zqcejywslocity directly between two long straight wire*-pzwsjg:y) c , zeh2tqxv/ e+s. 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.