09.18: A wire has a conventional curren3 +d xa8biq*ynt I directed to the right. At the instant shown in the figure, an electron has a velocit q3+bdn *aiy8xy 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 s(czrdd.6kmp k;l54echoice best describes the direction of the magnetic field at cez;p4. 6 5kdld (mrskthe point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional czs(d d0u( 6xacurrent I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the rig0dd( a( 6sxzucht toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving 37t wpdy1ny;utoward the top of the page at the instant shown, what is the direction of the magnetic force on the proton? wpn;u ty13 d7y

  94.30: The conventional current I in a long straight wire flows iql;,sr e,k, axn the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance ,qkxer; , a,lsR from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform magnetic field whvvpiphkg0xr*r,mx(r- 52 n9y6 i q(rwose d 9r -,igvryxvq0*(pmxkn( rp i2h5r6wirection is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magq -o lb r:xskezg7*:7knetic field whose direction is parallel to the particle’s velocity. The particleo-7zk *xqsrbelgk 7:: will

  03.34: A positively charged partilbf 7dvf;xh (ja1j4. kcle of mass 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 electric force on tk74x( ;jlf bh.afdj1vhe 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 regiontwcj2 hdb45:j 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 direction of the elec 2 wjh4cb5jdt:tric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negli 2+az7dkukwd2 gible weight is released from rest between the poles of a horsesho +d7wdzkua22ke 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 t+gt r vhe9()4epfo)) bnh4uqdo 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 v))et(g d pr 4uhfq)4b+o9eh nfield, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with speed *s qsn;zu i(j+j(idl .$1.00× 10^3\: m/s$ 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 r,:1ax t9so8 wrqdtz(br;2k) j orp :s6oup1v 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 circ p r 21)w(dr kr:ojzrs:qbxto t,s9;6a1 v8puole. 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 entu r/ gmozo9w 30l95; l0*xy p-xehupgters a 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 yo0/ h-pexgx5;wu3 u9l*p r0tmgo 9zlunchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a ct/bi8/x ymy6 tacx6*xircular 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 6*/tbtxam/ic x6xy8yis the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. Theow tc8u12jom(/w zb+x2 tks5j mql( :l ions carro(x/s8zqtub tj(m l52wwk cj1mo2+:ly 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 chae0r 3xplto849my/ vuyrged particle moves to 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 m 8ul3o0/yv4 xe9t yprthat the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic e fdmjvo:j)kl*wfn: z3j9):runergy $E_k$ 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 comm3qju 1t;vzk /2k cj yuzm8f*o:only determined byqz:kfmj o/tcv2u31*j ;zu 8yk

  09.27: A proton moves straight up the plane of this page into a region that hxgz+ yc7u kvdqjk*926as a magnetic field directed to the right. If the particle is 7yg2k c +9*duv6zxqjk 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 pa pw6vq+m.dblsml*z;w 0)ida 3ge 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 dm 3 b.pl*i6;dzwqvas 0mdwl )+irection of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocitn* l u.rznl;5qy through a region of space c;urnq.*z5 llnontaining 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 a ,0.4cch3asnukj (ab mt constant 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 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 th 43aj(0nbc,skm uc.h ae region originates from an unseen external source.