09.18: A wire has a conventional current I directed to the right. At the instan.k5(: d.hsn uqafce- et shown ck: eq.ds n(.he5uf a-in the 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 describep n gc 93a/fp/bn9r.2m wp f9vshwg-+zs the direction of the magnetic field at the point P located directly above the center of the magn9b -h9pm. 9fagfzvr n+w2gw3/p cn /spet?

  11.34: A wire lies in the plaza7zxja(69b s 5h se3hne of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electjh9eh6sx3baaz z s(75ron 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 towlk1 ,fj 8t/hcbzk((bbu ad70d ard the top of the page at the ins(,7db tcfl jk 1/hua80bd bz(ktant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long stres qou e( j(9scw1*tl7aight 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 distance R from the wire and heading directly toward it, the force on the e(qt ju1ceow9(s* 7sl proton is:

  95.16: A charged particle with constant spi /4t9-hgp.qe8c ocq reed enters a uniform magnetic field whose direction is perpendicular to the particq4gce/r thpq-.8o9 cile’s velocity. The particle will:

  98.10: A charged particle with constant2oz 4ap 9 4uz*o:ex4yyxeqx.d,;i b kb velocity enters a uniform magnetic field whose direction is parallelxybqk 4;:zxoexo4p u 2da9, bzie.* 4y to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at restt nz0z(e 6964eflfdua on a table. A non- zero electric field E is directed into the plane of the ta606eefaln z9t d(u4zf ble. 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 velocity in tb ,3 ))pgr4vhwm6 oeia region of space that has a uniform magnetic field directed into thet4grevp6bh io), m3w) 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 negligible weight is released from rest be bwu( ;kcmk.770ibxt,ev wo5ltween the poles of a horseshoe magnet as shown. eo.c0tbwb7 kw ,vlmk ( 5u7;xiWhat would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving i04jxej; thi og*;n0pl+ g *s d/1nmcazlo7et2n the plane of the 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 ap;lzl0/*7 *j21gs th ;ieo+gte4mn0 nxdcjothe magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves withc k:v.nbeug (- 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 −t5na8pm q*7 tge and mass m travels 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 cn 5*tpgmt7a 8qircle. What is the amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with chardb)sf h0, xzpun7+/7dq3wbg kge 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 sez,b)d+ h3w0 qpu d/xbg 77sfkncond 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 10sj+sby 1u wqcircular orbit in a uniform magnetic field B. A helium 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 speed of the hqssyub1+j01 w elium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. The i du:th;r54zqaon 3ls+ons carry the same charge and have the same path radius in the magnetic field. Which of the foo +ls azd;un4 3h5qt:rllowing quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters adj0f+s nz pqd:f+shnx* h(3-b region of space in which there is +dzqhhs f*nsf dnb( x-p0j:+3an 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 constant velocity?

  96.40: A proton of mass M and kinetns,l p+8h :h*q r1torxd, t3pyic 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 determined m(hqje6zcs maf(af)77 7 3mji by3 jmc7mma7(hj7if6f q z)e as(

  09.27: A proton moves straight up the plane of this page i54jo rydxhtfsyz9/d cg7.pf3klbl.99, w w3 unto a region that has a magnetic field directed to the right. If the particle is undef uzk pfg9l ,obj5 d.wdlf39/t43h7w .x9crsyy lected 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 planf*d,qo:gap.dd q3y9v e of the page through two regions of space along the dotted-line trajectory shown in the ffd,dqoy3d :*a .9qpgv igure. 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 direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive chargzwnzh+/ fa0u4 e moves with constant velocity through a region of space c+az 4u0fz wn/hontaining 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-/h z:c7*d g 1o nktg);cqb gim,i;,cbozero velocity directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite d h7)ob1;,ocdn;:mtgz*/c i qikcb,ggirections 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.