09.18: A wire has a conventional ;rk(4+ls -j4rcbqdy 8*hluk )hb1 imvcurrent I directed to the right. At the instant shown in thurr( hq*vdsic l4 l+km-bkyh;b )481j e figure, an electron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best dew 97,odp14 i 3/8;r2hnyfjignsak vor scribes the direction of the magnetic field at th/f8i,h42rik wsjgv 19yao pon ;7nr3 de point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional currenm. fc0u:hx6jdt I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right towar6 :j fduc0mh.xd the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving toa2-3x g+uth 0ehzhx )k/p 4iukward the top of the pag zexk ta2+kuh-hi)/43gxhup 0 e at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long stra2jto35)cuub aight 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 di)b o35uu2atjc stance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with c uumlr.l)3wo8q4/f hmonstant speed enters a uniform magnetic field whose directioq h/l4uromu.8f)ml3w n is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velcf)c6:9, vqt+tdcg yzocity enters a uniform magnetic field whcf9)zgct,cyd:+v 6 tqose direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A non-*. qzl:w4qf45f1w.b av / vgnc( jyvfrb/9rh z zero electric field E is directed into the plane of the table. A non-zero magnetic field B is94znw5qjblh w1b4zqf/c * va..: r yfv/g fvr( 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 velocity in a region of spaceyqbze.-7s + ,lgaj6 bw 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 thisayq.,z lj sb g+6-ebw7 region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from fdy ppk e2v/(8iss 8a;rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge ca8i8ea/ p;sf(p2 yskdvused by the magnetic field?

  10.26: An electron moving in the plane of the paas-,k zs lf-w4ge 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 the direction of the resulsk ,-w4saz lf-ting magnetic force on the electron?

  11.29: An electron moves idb.,pjxr ack +m),l3leg 9 2bwith 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 atxq/+q:gb/wl: 1 z qs- e2esqcd 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 ameb/qx/+ :qg qs-:cqz1 e2d lwsount 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 eng.w. ua-cpa4wd n. oz;ters 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 aroc.wz. 4an;u-d .ap gwe 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 field B. A heli/qp4)i xo591tja l btxum nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magn)4oabxixj9q l1t/5 pt etic 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 torwi(nshk ,1et3ni25k- -ovjy the 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 thin( n, -t2jser35oyhkw1vi- ke same for the two ions?

  02.15: A positively charged particle moves to thmoaz7.w15.8 j. whidscu+o nipxz1 (s *kj2qoe 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 maint x.cmzuzsnw i5p . *j8w7.qik+dh (ao 1ojs12oains a constant velocity?

  96.40: A proton of mass M ang s6f;s6c-..l gydaqsd kinetic 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 commo2w.0a ce /o*otkwfbei8uw.0 cnly determined byf2kia tu0oe.eo. c8bcw*0w/w

  09.27: A proton moves straight up the planeweg 2)9 o75pym 8tihpl of this page 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 bepil )m t5pg7e8yhow29 a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page ldks 7 -zexgh :m,.y+qp t/i7qthrough two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Rm,k :qidlqe+z7-p s t /gx7yh.egion 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 velocity through a region of sp5r h :vphuze:l +/*r)4.zz8lx7ynyv z*qwvks ace con 8rkshn4*.5zr:ev7 yu vy vh*w +lzqxzz)/l: ptaining 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-zero velocit/orl0 rek(jz 9y 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 thj e0o/l(9z rrke location of the electron? Any electric field in the region originates from an unseen external source.