09.18: A wire has a conventional current I directed to the right. At the instanof (/;le,qtr+cr bng 7t shown in the figure, an electron has a velocity directed to the left. The magnetic force on netqr+cr/b;(, 7flo g the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best desa*irr)*1b ib acribes the direction of the magnetic field at the point P located directly above the center of ta1 ib* ab*irr)he magnet?

  11.34: A wire lies in the plane of the page with convenpv5. ke mchj8q7,r)rwtional current I shown. At the instant shown, what is the direction of the m) kvp7,wj. qhcrer85m agnetic 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 t4. *f)f p)p:uh)zuju.z dvru noward t*uund))) f.zuh prjf:4up vz.he top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows i oyp0g2 :,b bsl6nboa:n 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 hab0bs: 6bgyl,o : opn2eading directly toward it, the force on the proton is:

  95.16: A charged particle with constant spyg6y7x+ xwx*wpx 4f4xeed enters a uniform magnetic field whfx 44wgp7+yx*xx 6ywx ose direction is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velz ;25gtak wviyk. w,j y.f:kxz5s+uv5ocity enters a uniform magnetic field whose direction iszk,;g2svxw5ka5y ty. w+:iu5 k vf.z j parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a ta 7ql9np4 qmk,meyztj,, d7vq- ble. A non- zero electric field E is directed into tzt,enk, jq my4l7 ,vq 9d-pqm7he plane of the table. 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 non-zero+ wy0kjm2as3b velocity in a region of space that has a uniform magnmy0a b32sj+kw etic 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 this region of space? Ignore gravity

  04.14: A positive electric charge of :ajet d*z2 6cuac5ub3 negligible weight is released from rest between the poles of a horseshoe magnet as shown. What wou*2zctj53ba : cdu6eua ld 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 an19 oa zrkpbstuh, .7o4 angle of 300 to the horizontal enters a region with a constanto4b7pas9h 1r.k, u zot 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 m1u1rigv9 a o 91gobraus;:yb8oves 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 speam vt)f 1o.(sped v in a plane perpendic(.o ap)vtmf1 sular 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 amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, c-qbapm; l+yk-w)1bg-rlm.f mass m, and speed v enters a magnetic field B and is deflected into a path wi;wl)+qabgmk -l b1-cmfr p y-.th 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 magnetic fiey xcycue pwj4w k*ezx7vk9 p:6) c;8p,ld B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same 4vx79y;)kucwp8 k , z6e* c:yp wjpexcmagnitude 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 unqa+pre9s2ul/d 2uxs ,3/y spxyz (8n miform magnetic field. The ions carry the same chaus/ypmu9 ,z+ (qxexssdn l82 pra32 /yrge and have 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 moves to the right. It enters a region of/rr3 wjefe.n - t-*zg jycj8,o 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 re re rt ofy*-. n3-c/ejj,jgwz8gion so that the particle maintains a constant velocity?

  96.40: A proton of mass M andct)*c4s;nn r)wk .bawoyq*uu* 7ihu: 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 part4f ja.( fnzi *f;n4rcdicles is commonly determined bj*r n af4z(;dfi.n c4fy

  09.27: A proton moves straight up the plane of this pag1ku6(6gyy .+:itrim q*j5ffk8tygos e 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 direction58uyk6t jfq.fiy(1o ikg sgm6r*y+ :t must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regi mi* orh4 tncl4wbmt7:o41wzvw0+lo 8ons of space along the dotted-line trajectory shown in the figure. There is a uniform electr0441ohwmwvr4:z no bit*lo7mlw8t +cic 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 region of spu2 z1 7bpefvw(v fi4// n knllsi1pn+)ace containin1 +i2p/ n 1)4lpeifkvsz (/u lwb7vnfng 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-zehwt;s-fg :5hd+yzz /fro 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 zh:sdh/+5gtff; - zwy 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.