09.18: A wire has a conventional current I directed to th e 5ind 8bj6br6;+mkyue right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic forceemib+b; nku djr8y566 on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best descl(q o 1jg,phlq3 oxl,v .4xwgf0ve g;f,zv)y)ribes the direction of tgq,,3pq ) .l; jy0( )1zlfvgw ,4xvlvghexoofhe magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional cjicr6d,dpsq*1j wd7 z zw,.q 3urrent I shown. At the instandw,rwjd .d jpq6 z,qz i13sc*7t shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the leebg iuz*j7lcodo25+ ( ft in a wire as shown. For the proton moving toward the top of the page at the instant soe7 b2l+o* (i u5dzjcghown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straigh xsdub 7huh5(5lsnw-1t 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 heads71w5dl- nuhh us(x b5ing directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform mag csqul3)bz5i a:ha u9)netic field whose direction is perpendicular to the particle’s velocity. The particlquuiz5)calasb9 )3h :e will:

  98.10: A charged particle with constadu zf9o,mf x4*nt velocity enters a uniform magnetic field whose direction is parallel to the particle’s veloc9ff 4o dm,uxz*ity. The particle will

  03.34: A positively charged particle of massywr 9;+uilc g, 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 the magnitude of the y9c r,;uwig+lelectric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zetw)/ kg*n(jphku xc 0,+f(dbdro 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 directink/t,k+( cu x*pgjhfw(dd0 b)on of the electric field in this region of space? Ignore gravity

  04.14: A positive electri ;-7vxfn gi5sxiqm7 )ic charge of negligible weight is released from rest between the poles of a horsqi f gv-i7;5 7mx)xsnieshoe 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 the page at an angle of 300 to t6p7f pg*(0xf6 xw3u tlshmk,vhe horizontal enters a region with a constant magnetic field directed horizontally in the p0p(h6 sw63t kp umxfg,7xvlf*lane 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 moves with s l2 0: maj.yg-:fi 5kwxkcc5cypeed $1.00× 10^3\: m/s$ 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 vaxe jv gk(l y,kba 3zn)yf5:)8 in a plane perpendicul,3( lgyya) ej5avfzxnb8:k )k ar 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, mass m, and speed v enters a magnetic field B a3of522li jc+ch -iobsnd 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 +i fc cosjoh52i32-lbwill be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform mzif n mhf1nhaz3-a5;-jn. w0gagnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each parti;fi-hnn hz-.af m n31azjw0g 5cle 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 sze4 y/l7 vpn,/fex,a +r/ hdepame uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for the tw haeef, 47plyx/end/ /rv+,pzo ions?

  02.15: A positively charged particle moves to the right. It enlip1 khn:4bqugz n,2,ters 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 ml ,ip:bk,nnzgu24 h1qagnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of ma-+- oqsldyc/:irb)l.eic f .xss 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 elj+0itbgidc. lm3f: ux 0tqd8 4ectrically charged beta particles is commonly determined by.d4i uc8it3d0xmq0fl+ gbt :j

  09.27: A proton moves straight up the plane of thi-vl px3 gh4va(bvsy)u)i0 )lvs page into a region that has a magnetic field direxhv3)lv4pg)- 0 yvsl()iab uvcted to the right. If the 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 sp 85 w0z/uczsl+j1jtex, .qf rgace 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).fst1wl/gzq jj0zu8c5, +e r.x 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 constantfrcg2 q633zaty 8ktcde7de+35*vq hq velocity through a region of space containing both 323aqgq5+ * e3d t vtedyzk8rq6c hcf7an
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 lov mv uydp,277png straight wires. The 7 d mpvyvpu7,2conventional 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 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.