09.18: A wire has a conventional:bog/ u 3n 9i1cgzebl: 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 this instantg:bug z/ie91n3c o bl: is

  14.24: For the bar magnet shown in tgytwu y: ; .g726*ogbapo bb4jhe figure, which choice best describes the direction of the magneti64bgwoo;u: p2gyb a bt.*y7 gjc field at the point P located directly above the center of the magnet?

  11.34: A wire lies in thgs6*a)6fqc3cbs3jwvgo: yacn 07q 5 pe plane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving d)ybow5p0q f 6j3 *6a7sns 3cv:ccg gqairectly to the right toward the wire?

  13.30: Electrons flow to the left in a w mmfa/m0uibo-zga1 c /)9mir bl 3(h/uire as shown. For the proton moving toward the top of the page at the instant shown, wh 1zfa0ab g9/h i)ul(/im-rm/m ou3bmcat is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flo-o9usbi7s,d k ws in the upward direction as shown in the figure. (Electron flow is downward.) At the instants-7 i,u9od kbs 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 mag-x pg;1. vr.bncnjbf2netic field whose direction is perpendicular to the particle’s velocity..ncpx2 rf1bj-v ngb; . The particle will:

  98.10: A charged particle with consta;w ey-zio5jj. nt velocity enters a uniform magnetic field whose diro-;.e wzj5j iyection is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particlel,ey pe u( k:d6zh bcrs8 2tg5gc*q2-q of mass 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 (y*,g8ez2q h :kuc l5g tbc-esq62pd rfield 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 velociiwoc/6 v,llqv 9ci - 0lak1te,ty 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 directi,-,i 1ctlivecol v l/k0q 96waon of the electric field in this region of space? Ignore gravity

  04.14: A positive electric char/q, a rr;zdzkw/ojm0r 9; qwr4ge of negligible weight is released from rest betw;zaz94wr/;r kqjqo r0,dwr/ meen the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 97tb oplz .ps3.isc* k300 to the horizontal enters a region with a constant pzbo*s .c k3spl7ti9. 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 w0v+y;urf o5)ekp )qnlith 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 pl8fs0nl24vvew, dcx:vx6ou 4aane perpendicular to a magnetic field of magnitude B. The electron folloxel2fa4n4v0dv c,:x v w8s6 uows 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 /5g itv7ugwg.speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has sptguvw/ .gg57i eed 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 magnetic/ahnx*nfgyy* .5c uw* field B. A helium nucleus moves in a ci5*nc.y /g* nxfau*why rcular 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 magnetic frok )2(k f9bdbield. The ions carry the same charge and havekk () 29dfbobr the same 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 su5 kwinsba, 2in6k f 79t ,xi 7j.id.1jjnz.qmoves 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 poiiis2xifn.76n.1 jt ,5kbq j.ns az9 kj,du7iwnt in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kineticnv g, m*-h(sk h2zxm/bd 7t)be 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 determinedvl+c(3oc ggn- b3c-+(lncv og gy

  09.27: A proton moves straight up the plane of this pa/ l4- eqs8yoihge 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 there be a compone /o8s-lqh4yie nt of electric field? Ignore gravity.

  08.36: An electron moves in the plane of ty)ltt taps :37x.1 cy zsbih+6he 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 in Region II. What is a necessary direction of the magnetic field in regions I and c.y6 tbs:htp izx13 )y +l7tsaII?
Ignore gravitational forces.

  12.36: A positive charge moves with constant vea+(ixdtp dg.p )kx1-0ku5t aq locity through a region of space containing ba+xtpkd giqk )t.dp5-u ax0(1oth 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 co-w3m6vtyu3)6n s v f1nwvyw5 vnstant 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 sho3 t)wu-w y ys6 v5wnvvn3f1v6mwn 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.