09.18: A wire has a conventional current I directed eza(4ix-ma367g* dnpy0 n pxtto the right. At the instant shown in the figure, an electron has a vxpn gez-73x 0t( maidy6np*4aelocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar mag3 kypq h56dywkhx xf720 (sa;:+tljwb net shown in the figure, which choice best describes the direction of the magnetic field at the point P located directly abs0+6 ay2(tk3d5 qky7 wwjf hl;phxx :bove the center of the magnet?

  11.34: A wire lies in the plane of the page with conventik di+n br1 ox2wpy u9:0olcl-;onal current I shown. At the instant shown, what is the direction of the magnetic fo: ony;-b2l1x l9u+o 0rdkicwprce on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in hfzy,m90h7*st(p o t pxn81 jfa wire as shown. For the proton moving toward the top of the page at the instant shown, what is thej xt p97fmzh(tf8n0 o psy*1,h direction of the magnetic force on the proton?

  94.30: The conventiona/hxai gkh7q ea5t;3t42y z.4fl cvv/k ooa5x5 l current I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is aeqcaa h.i3a7k5ot25vxv xgfo /y4/;5hzl k4t distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with cons2z g ,fs .g0e(xf.sujrpp1l6gtant speed enters a uniform magnetic field whose direction is perpendicular to thef. rgxlj6,.se 0 p(2pfgz1g us particle’s velocity. The particle will:

  98.10: A charged partwq4c w+vl5ik0icle with constant velocity enters a uniform magnetic field whose direction is p5lqw k v0+4wciarallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on ak6-gb )*ft oqn table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is dib-f ) *tgo6qknrected 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 th 9w0y y mos5i-sux 6ko7jm7(ilat 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 fielm9isoy5(uo xm7w-ly j6 7k0sid in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible9t m0u2d;o,qmc bslr4 0ntt 7v weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the a7mb0tmo2ln,s4rv9 0udc t ;t qcceleration 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 -i c)gx/( md-oq6tcqn1pd(+pv 0-keqh 3bbyp 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 direction of the resulting magnetic force on the electron? q c/(g ve(nh3b)ipo-dp06 qq+cbxdt-1m- p ky

  11.29: An electron moves witik7 wwr (-al6gh 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 rk +ns;db;:by 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 tsbn; d:r+kb y;he 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 etjnmyda +w(/naflp3k) oe *p;,9 w3ea 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, and B are unchanged, wee( 3; 9tf n*lw)n mkop3aad,ype+j/ what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in p1*+rbm,m:ez;rm np n 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 du1m+; n enr: p,bmr*mzpring 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 magnetixd8;v x qz2nzznf:,, nc field. The ions carry the sqd, v :zx2f,8nn ;znxzame 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 tozr xaqt3(1ywph ;qmxi a*4 :g;w*s 6so the right. 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 a magnetic field have to point in this region so that the particle maintains a constantw wzoyi;h(xar13;p4xq6g sq sam:**t velocity?

  96.40: A proton of mase + tucfae 1c-yux9l v-(0)vxvs 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 electricallyv*x 7)6hsufemz9 vp1x2r1pv p charged beta particles is commonly determined byvpu)29p sxvm1 vfep *z1h 76xr

  09.27: A proton moves3tbrfc8rdu g 5(yxpo5e6v+6s straight 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 passx 5r 8 63 pogutd6ryv5+(bescfes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane ofvp 1)wb h4m0eq*k*3pa x lw 7baqgw2 sqwu8q)4 the page through two 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 direction of the magnetic field in regions I and IIq 0*)kwmwl )aq1wex3qp*uq bbh7 2vp g4a s8w4?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a+5 q :d/p1hcl*oc60rauij b mv region of space containing both a*c 1o mcpdruj:b5lvh6 /aq0 +in
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 co7hn2f /tnse(a 87aw flnstant non-zero velocity directly between two long straight wires. The conventional current in each wire has th nf87hf san7 2ew(la/te 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.