09.18: A wire has a conventional current I dirj9 u,c)+jsrblected to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The+s9jj) c,ubrl magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figda:sqz i1pd/ )ure, which choice best describes the direction of the magnetic field at the point P l dz1qas/i)d: pocated directly above the center of the magnet?

  11.34: A wire lies in th8 /n5st+w b :k/;i6w vjyxujgpe plane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right tow5giu:s /k6;+8wbx yjt vw n/jpard the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving towa.j9 s7f0 f(ldhi5aqs jrd the top of the page at the instant shown, what is the directioj05 hfsai7q fl.( d9jsn of the magnetic force on the proton?

  94.30: The conventional current I rxwz,vquk/:1 in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a protr/kw z1 q:x,uvon of charge +e is a distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speedv)2qhddkg 6( ztm9k.o enters a uniform magnetic field whose direction is perpendig)d ( odz.htk926qk vmcular to the particle’s velocity. The particle will:

  98.10: A charged particle mdph-op 5t6(ak.-c tdwith constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocityok.dp dtt(-h5c6p- ma. The particle will

  03.34: A positively charged particle of mass M is at rest on s6n8 o 8qi,1:yqtrphe1q kmz -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 electric force on the parti,8h n:s q q-moekz18qi trp16ycle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero velocity in a region m;d( gx0;t 7rfqm/wteof 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 th qt7e/m;t0 wg(rfmx;d e direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from re: w uw-.l8bzpdst between the poles of a horseshoe magnet as shown. What would be tb.8lu-: p zwdwhe 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 anghnr* x nbtyv1;t-2(2w(u wd* x nc2lgxle 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 t* n-(y 2vlxn2 2wdwrt1n *x(chgux;belectron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moycgd1qs;by0mf *zy2 e7-8zr oves 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 travel9 /gs,)qm7*z dtp)ks a*plj4nmc/x sqs at a speed v in a plane perpendicular to a magn gps mq 4)k/l9 /s)*q smdtpj7,xacz*netic 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 chazs0wpk,j 9 p1nrge q, mass m, and speed v enters a magnetic field B and is deflected into znwpjk,9 s 10pa path with a radius of curvature R. If a second 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 circular orbit in a ud8w.rha5n1* lgfqd1 sniform 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 helium to the speed of dqn8f. ah5l*1 gdsr1wthe proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. The ion:jzjnf*:jva/mpgy.m xjfm5 ,7 9 rb ,zs carry the sn*vjj/az, :px9b 5rz7mj.m ygjf ,fm:ame 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 r*n3 o1: cq -af5jm8s+2vtqckgup lxu1ight. It enters a region of space in which there is an electric field directed upxlj5+*uq k1u 21c qg:8snpfvmc-ta o3 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 a)mcm of :6 vm:5pl1dmynd 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 beta particles wvwpky-,hi*c /77fct is commonly determined b ypwvckic w/ ,ht77*-fy

  09.27: A proton moves strap1 ot;f e6 blkc.qih)jnuw253 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 passeeq2in3w tljfp.c)h61 bo k; u5s through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the planel dch:jm 98 wqocni.(* of 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 f8( cjowh9dcl. :miq*nield 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 constant velot tntpp/)f7zn -g+ x:bcity through a region of space contaf:tpx)gtnb /+n pt7z-ining 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 con3,n , za dinmp2p+a2wt*v*zlkstant non-zero velocity directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite di wplpzza22k3+a dt, ,nm*vn *irections 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.