09.18: A wire has a conventional current I directed to the right. At 0cwv) 0+*x u )d(:t tnqvlnv4kifj:gsthe instant shown in the figure,i(s+0gnvk* 0j): :tqc vtxfdv 4ln w)u 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 ;vak nihk );f5choice best describes the direction of the magnetic field at the point P located directly above the center of the magnaifn ;;hk)vk 5et?

  11.34: A wire lies in the plane of the page with conventional current I shod,*6x tzh g q bu(+6q0aqszu3bwn. At the instant shown, what is the direction of the su +u,0gqqb6 dh3z6q x *tzba(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 r;5i0v biw6jy(5se3 tyht-xd toward the top of tihdt05 y y3-we(5x6it;jbrsv he 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 in the upwa,qh1*i,oh s owrd direction as shown in the figure. (Electrh *,o1qsi,h owon 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 condp( v7s3fw kyk zogpzv,28y:, stant speed enters a uniform magnetic field whose direction is perpe(3voyvzk gp7 w,ds8k,fzy2:pndicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a sb8oi1 z /gte+uniform magnetic field whose direction is parall z+8 io1stbeg/el to the particle’s velocity. The particle will

  03.34: A positively 06r5g6pdi t xmcharged particle 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 field B is directed out of the pla0r6 6p5imxtdgne 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 eia7 mnf zq. rspq9,6s9;fve2of 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 direction of the electric field in this region of space? Im2ifa7nr z s 9qs;6 .fq9veep,gnore gravity

  04.14: A positive electric charge of negligible 3i whc:7qsh o*zm,9*wa3jkb j31 ptz xweight is released from rest between the poles of a horseshoe magnet as shown. Whatz3a:*79z,x*mo wc3jk qjp3ti bh swh1 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 ofb8jh/q0nh;hl k kkm0 - 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 dirhklh/ ;h 0-mbnqk0jk 8ection of the resulting magnetic force on the electron?

  11.29: An electron moves b p(fipw::e3owith 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 travelsa. k4k5;f st)ehg6go f at 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 amount of work done by the magnetic force on the elect gks;4gah f5f e.otk6)ron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a;k i jnllq4pqt,c.,w 7 magnetic field B and is deflectec;l , 47qwtjq,nklip.d 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’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic field B. A heliuv 7n55b4gmkp. 9uceyxpf gt63 m 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 speedgugn4c y57b3 k v5pp6tfe9xm . of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same hru4)w;axy zw9/yo/ dv- v.ewuniform magnetic field. The ions carry the same charge andhu /. xw4zdovyew;)y 9awv/r- 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 chargeddnc(zou3fk5+ub6 pu5(m ey 5s particle moves to the right. It enters a region of space in which there is an electric field directed up the plane of the p(p6e5sk3z +umu5 fndyucob (5aper (see figure). In which direction does a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kineg 9 an:zy; q5ohyhd;t7tic 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 ,6bcw s ;pvq:x0t 4iyldetermined b ,0pb4;sct: wq y6vxliy

  09.27: A proton moves straight up the plane of this page into a region that qef :eg.c)hg* ; kvn,mhas a magnetic field directed to the right. If t *g.,en:vge hqf)k mc;he particle is undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regions of spacb 1epk1yrk1 y2f7 vg-se along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directed into the plane of 2 11p7kyb1e-srg fyvk 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 cv5k gv.urbov e1rc i+u: kb,*n i*6;fwnu5z+e onstant velocity through a region of space containing wv5evuv+ *6 1: oii*+nkbr ;bzku ,erc5 .ugfnboth 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 directly between two longxcm5jh (-7bv vt-rf -e 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 gra(vt xce bvhr5- m-7fj-vity, 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.