09.18: A wire has a conventional current I directed to the rigp*w1okhur*ke: i/xwe 4 cnj10g kr 3,iht. At the instant shown in the figure, xn4i,jw hrpgk we*ikc10kru3:1/* eoan 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 describes the d5n 6. rc5crf6jw4;(fkr/x 1gwxa ibluirection of the magnetic field at t ;(xa.rck5i wg14c/rf 6x lfnw jr6ub5he point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with v7 2w84a9nba gyjkw +iconventional current I shown. At the instant shown, what is the dir+i 47ygbwa2wka9 8 vjnection of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the lefty6jn 8 ed2anf0y f.hld3j/cz. in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the protocje l 8f3 d.2ah. y6f0dn/yjnzn?

  94.30: The conventional current I in a long straight wirbyf l y9-21/kb8qx iune flows in 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 heading directly toward it, the force on the pr1ful- 9qkbiyyxn /2 b8oton is:

  95.16: A charged particle with constant speed enters a unwaiky,) +o/s 35rjm d*j +zxydiform magnetic field whose direction is perpendicular to the particle’s velocity. *)raw3 d, d+mjjy/5+zykoxis The particle will:

  98.10: A charged particle with constanr,fvn3d 1, 9tf:hdeg 5lz/ pent velocity enters a uniform magnetic field whose direction is parallel to the particle’s veloci pl/dz 9eevnf1fng ,d5: ,h3trty. The particle will

  03.34: A positively charged particl5:p2l hvgdp- se 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 plane of the table. What is true about th:vdl- g5p2ps he magnitude of the electric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moveh1 e2a e9qd z.ovqp/h,s with constant non-zero velocity 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 direction of the electric field in thzh , .1hepqoa2/d v9qeis region of space? Ignore gravity

  04.14: A positive electric charge of ne-)9pgbgl lls*j mm0l8gligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge cgb9*sl mp-8l)0mjllg aused by the magnetic field?

  10.26: An electron moving in the plane of u8amb tb 03j,du/k9yg *a8cg nthe 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. jdbak ang/ ,3gb9mt8u y0c*8uAt 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 mov )* ,xcznnuadco8+zn z*2j .sd, 73yisb)itp ces 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 speed v in a b ly/47hkgo,voat6;q 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 electo gy4 qalvkohb,7;/t 6ron in this time?

  97.28: An ion with ck grawn1ux 69*e3ur3unlzzm9z 1,9l jharge q, mass m, and speed 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,x manz39ulurjn*1r,zg e u9 w193k6z l 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 helrrwd*yx/2gn t./ wt9(qmr h0 yium nucleus moves in a circular orbit in the nx2w tr*9r(mrgyq t /d.wy/h0 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:3tmbmi gsc6, . The ions carry the same charge and have the same path radius in the mag 6cmbit 3gm:s,netic 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 re/,3 uio hag+7esy+il (xksb6mgion 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 maintains a consta,7y s i eom(shk+ x3luib/g+6ant velocity?

  96.40: A proton of mass M and kinetic enebg7;xlzii0s4 4ntw yh / nvt2.rgy $E_k$ 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 chargeefg89xu +(asi .gh/v id beta particles is commonly determined bv+9.f8(asi ghue/xg iy

  09.27: A proton moves strad2 m(4vpl-go tw.gx3z ight up the plane 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 be a component of g w -3.lp4gv ztmox(d2electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through r55zd/2de/ew/dgh -coewt ) itwo 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 direi z-ddewrcg w2e 5oet5 /h)/d/ction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge 1p*lzff* x*p umoves with constant velocity through a region of space containing botl1 * p*zupxf*fh 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 /c3ctw. zz(:b tu/eht2l,hg mat constant non-zero velocity directly between two long straight wires. The conventional current in each wire hahhg c/uc.e,btt/ 2l:ztmw z(3s 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 the location of the electron? Any electric field in the region originates from an unseen external source.