09.18: A wire has a convee6:cglu/ l hi)fbvz2wrd -.8vntional current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to tv-ugif/ hb:26w r8czleldv).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 describes the dq74vg )rn 5qh9dul,7 :id utnwirection of the magnetic field at the point P located directly above the center of the magvlu id)q:7wrd9gh547,nqu tn net?

  11.34: A wire lies in the plane ofo* a5 n: ctu-)m,n:n 1pibjbeo the page with conventional current I shown. At the instant shown, what is the ditjepb :con,nma*5n1 bo)-u i:rection 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 6ps9wcp/,a)lew r)x3 g 6htqk wire as shown. For the proton moving toward the top of the page at the instant shown, what is the directalxw p/hq,e63 rck9 wspt)g6)ion of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upward x* bpvcm/-7w dx 3dkb* gm 47sp+hvg53kb+ jgpdirection as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a /jbx5b+ d vc3- gkdmgp3bgh*+pwxk*4v7 ps7mdistance 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 magn4xqek)c zpd -hd dt03oo;1p5oetic field whose direction is perpendicze3c hd p41odp;kq)do 5 t-ox0ular to the particle’s velocity. The particle will:

  98.10: A charged par xegoqqp*aamz/9;fer:2l* t2ticle with constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocitmt xe*o2 *epqlafa;r:g9 q2z/y. The particle will

  03.34: A positively charged particle of ma 7i b ghetfe-pyfy( r-; yujz716w97wbss 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 f w79bfyyt7 hg6- uji1zweyb -re7 (p;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 space thagnmi 4e73;noat z)bw 8t has a uniform magnetic field directed into the plane of the page inemo 7a4wtz3;n8g) b. 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 n(r wlpd*r )j8;.2yrc0o++hvdxgo iu iegligible weight is released from rest between the poles of a horses;o )+ijvo*8xdyr hl +2ug 0r cr.ipw(dhoe 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 tytk4-z m7lf t.he 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 be. 4t-7y mlkfztst describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves w) 6m7q-im uyedith 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 h8b, ful33d,e2c wri mm travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radih32 r,8 uf edblm3,wicus 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 speed07: eh q.bzpor 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, and B are unchanged, what will be the radius of the second ion’rh7q. z :pobe0s path?

  16.44: A proton moves in a circular orbit in a unifoc c+;rc).b ufmrm magnetic field B. A helium nucleus moves in a circul)fcm c;bru.+ car 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 field. The k(z ixabwlld+*,ge 2r7a r(5o ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantitieslka5 (r*2 wzi7lgd+,e a brox( must be the same for the two ions?

  02.15: A positively charged particle kxdkr fwe ;k(6h0/4k1 aow hk1moves 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 point in this region sokd1h ;/foekk4wkhxk r1a6 w (0 that the particle maintains a constant velocity?

  96.40: A proton of mass vf.m6*lv0r lu M and 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 electricqsvb)dtb.oc1*y1 n*cally charged beta particles is commonly determined by nyqb c1t)sc.o* *dv1b

  09.27: A proton moves straight up the plane o /cco0wt5vn* af 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 be a component of*5 0atcvon/wc electric field? Ignore gravity.

  08.36: An electron moves invf1xs4*d)gew dmthubgr0(* : the plane of the page through two regions of space along the dotted-line trajectory shown in the figure. There ism:tgd0hgdrx ube1 (*wv )4s*f 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 II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a regitpa.2o4 ioeq;on of space contait2 i;qa.o4peo ning 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 velocity 4yaq rr4k(*tgnz65 m bdirectly 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 ref6n5ytar4 4*z r(bkgqmlects 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.