09.18: A wire has a conventional current I directed to the jjsr/tv(*.q seggu4 h/qg31w right. At the instant shown in the figure, an electron has a veloc3/( t/ vw4.u *1jsgrsghgjqe qity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figureyhqj j2d 9wwl6v9 p-n*, which choice best describes the direction of the magnetic field at the point P located directly above th* j6d2hl y-w9qwnj9vpe center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I shown. )vpb0;i7hbkffv4 i (oAt the instant shown, what is the dire (7 vb0iiv ffb;k)p4ohction of the magnetic 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. For the proton moving ;peqcank8 zack/7 ml92me/4s toward the top of the page at t4m 8n ckp a/q2mee a79ls/cz;khe instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional curdjg*p b,apr51l)b0k urent I in a long straight wire flows in the upward direct5,0kp b b*prj1duag)l ion 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 heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant 2dx a+q0rz7vv1yv h)lspeed enters a uniform magnetic field whose direction is perpaxvhv v0yd)qz+ 27 lr1endicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetio r7qiyl0tqs:pu673wc field whose direction is parallel to the particle’s velocity. The p7 u3 tirqqy7 w06osl:particle will

  03.34: A positively charged particle of mass M id k iyg9e9jxa 87j/z2fs at rest on a table. A non- zero electric field E is directed into the plane of the t agi9fz9y82jd /j xk7eable. 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 n57j3og pch4el1gxu3pk tye4 -on-zero velocity in a region of space that has a uniform magnetic field directed into the plane o-e7pue3g x4p143kyog j5h tc lf 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 releas bdo,k*a 3t;0ht*lx xled from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the ch kxt b3x*lo ,td;l*h0aarge caused by the magnetic field?

  10.26: An electron moving in thd9rx lvqs *oty onb655p2b0* rg) 4lorcn.gy*e 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. .o*) lbnb5g9onp 0rtogvlyyrc 5*d 6qr42x*sAt 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 move8 o00xd2f9 qcl3s.* wvysurq es 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 plao:n cch4g ;7iane perpendicular to a magnetic field of magnitude B. The electron follows n;4acig c 7:hoa 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 speedv 2 x4yd1xq3to 4oqz-y v enters a magnetic field B and is deflected into a path qvy4q-3txoxzy2d1 o4 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 in a uniform ma(l ,06q4gg:mowmm zj+n; w wksgnetic field B. A helium nq,6wg wwozk j g;s+04lm:mm(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 speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magn/.lhfd: yl3v+ qou8htetic field. The ions carry the same charge and have the same path radius/ l3q.fo+ y8v: lhdtuh 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.7df :p7z 54v:y l coz+espv*ts 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 fields+p*tvv7 zl5 p eyfdz 7c:os4: have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic energy zi5ij l q4 u.jbp/+bq5$E_k$ 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 particl 2d i yh4l1vrl8*4x)7wuw kzoses is commonly determined bydxlus 4o84r*lz)y 1ivw 27whk

  09.27: A proton moves straight up the plane of this page into a 2qp (:1mcqvw//zgrc g region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what di qg gmc(wzqcr/v p/2:1rection must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page ig6 ez zc( 1rf)p+et/qthrough 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 fie1i+z /ct(er6fp)g zqe ld 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 velocity through a region of spacxu5fv8zc .q g5e containi85f uq.c5zvgxng 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 pqizkr+4z7+sf *) og uat 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 direction of the electric field that exist at the location of the electron? Any electric field in the regiof)*+zsu r4ogz7i p+kq n originates from an unseen external source.