09.18: A wire has a conventional current I directed-dbtg5fv5q.sdf c ne*ahw 4wb 9k7 58w to the right. At the instant shown in the g9- e.qat5bn7b4wf ksd f5dc8v* 5whw 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 despe*eg-sjhp8 )w2 :-k p4(8hshwdgej h cribes the direction of the magnetic field at the point P loc4*p -8phw-h8 phj s2wes)ej k:degg(hated directly above the center of the magnet?

  11.34: A wire lies in the plane of the ik f--7n0 *np*i xbkcgpage with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron tha-k7kxc0g p-bi *n* ifnt is moving directly to the right toward the wire?

  13.30: Electrons flow to the left f u 1z;dcav--tin a wire as shown. For the proton moving toward the top of the pag1;dfu--azvt ce at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long st34zj1aihq41r-qyv n craight 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 distac4rq i 1zyjav-n 14h3qnce R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uncmfrioxz3k6z; + ;sb/ u du2r7 xheg*7iform magnetic field whose directxb2igerzd+;xu3; mo 6/k u*s7chzf7rion is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic field* g0 17mxo(n,wg+ x ,mc k2n(buzzfklt whose dir7n+(*t ,0cmuolzk,mknf2(wxb 1 xg gzection is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a tab4 co-slb )(jxrp psd6:le. A non- zero electric field E is directed into the plane of the table. A non-zero m ( clpx):jod4 ps6rb-sagnetic 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 a region of space thn8 3b u7va+ouiat 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 83a7i bouv+unspace? Ignore gravity

  04.14: A positive electric charge of negligible weight is releayg0()z i mau-vsed from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of tziva) -(uy m0ghe charge caused by the magnetic field?

  10.26: An electron moving in the planeddr.(n tzplq9n no*+ - of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the planezp n+.n( ol*n9 d-tdqr 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 mov )(/fq5wgb73)q u+iainy nm nges 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 plane pery1qg6 tuf ou5,r -a2oppendicular 2a -q6yo5g1utoufp ,rto 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 spe9ni.k;gjl / 3jgb8x dved 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 jl nbg8i dk;9.x/3jgvm, q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a c/fngl*8ww-b4 -rb54ahlyzw x j fw;s* ircular 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 tn hl-8gfbrl*b ww5zs-;/4wyx wjfa*4he helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. 9+woq7can 51ga ,yamj The ions c9,wa+ na 5oqg17mc jyaarry the same charge 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 rigo nioxs*gzj:n us(w-8 t00tgzl+3l p :ht. It enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction does agt( ou8 xi *0g-z+wznsl0sn: o3jp l:t magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M an: (pchv5m ey qo3l3jo1y.id(d dt /4inh:ft1d d 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 betae37z x jp:ntdo)c66 se particles is commonly determined byed p)o 73ztec xs6n6:j

  09.27: A proton moves straight up the plane of this page into a region that,vxt dowpar/t,q gs-b-c; 8dhb3 k(o3 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 electrikoq8 t ( -gtapw;/s3ov-b,br dx3cdh,c field? Ignore gravity.

  08.36: An electron moves /aa9 c5(m y djet.nk3wld5v1bin the plane of the page through two regions of space along the dotted-line trajectory sh/1l53 y9t bnjm.5cdd v(a kaweown 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 direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with consto+wnttbsx5 c56 z+-fs ant velocity through a region of space containing bot+w5 xc+tzsso b5fn-t6 h 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 velocitm1s7;c h c2 3flegwdm4y directly between two long straight wires. The conventional 1hg l73dcm2 s4cfw;mecurrent 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.