09.18: A wire has a conventional current I directed to the right. At thjhzjj4cs q ot-.x)r. :e instant shown in the figure, an electron hasrj zj 4j )x-oqcht.s.: 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 ch0x 3ttre3 23)g4 q(tnjuzoj fboice best describes the direction of the magnetic field at the point P located directl r zjqx4(ntjt2b3e)30u tf3goy above the center of the magnet?

  11.34: A wire lies in the pla1s7)n:3( qe4m s4qw0l 3d onnudbfv tane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electronuv(7 oq twb1a)s ls4:03mden3q4 dnfn that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the2v9pw m) fuz7(wx:cnpz)dv f4 proton moving toward the top of the page at the instant shown, what is the dimp4v 7 x2znz9fpd:wc )w(fuv)rection of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flow5 g0cz:ciy(1kj drb /ss 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 frr5yb1d0s/: i kzccgj(om the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a unifp8w j-qzc9f8eh d3.(q kom+sxorm magnetic field whose direction is perpendicular to the parti jepcf 3wsh(q8.9dz8kxoq+-mcle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enzum3 m:u +e/uwters a uniform magnetic field whose direction is parallel to m:uze/u +wm u3the particle’s velocity. The particle will

  03.34: A positively charged n*ls0d(sp4fow*ukxz 5wiv*2particle of mass M is at rest on a table. A non- zero electric field E is directed into the plane of the t0v4 s5( wp*ko**zsdu nxf2wilable. 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 particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constanu 9/h 8-ajkn 3k3nqlql1q6v6gmp+m0o,run u pt non-zero velocity in a region of space that has a uniform magnetic field directed into the plane ofu pmql18u qqvh6n3n0pgua 69jnmokk - r,3+l/ the page. The proton moves directly up the plane of the page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is releaswrs;u4jwj22o56 zl vved from rest between the poles of a horseshoe magnet as shown. What would be the direction of the accelera2w lz245 u jvj6wv;srotion of the charge caused by the magnetic field?

  10.26: An electron moving p:zfxdbx v60fk/7 (r0ex6zzcin the plane of the page at an angle 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 electron enters the magz6kvp0:r7x(f6c fz zedb0 xx/netic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with speedo1mpsf1kx78o +s;s u l $1.00× 10^3\: m/s$ 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 l cw8pw.vw,x7 travels at a speed v in a plane perpendicular to a magnetic field of ma.vcw 8wl7,xwpgnitude 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 and imka7 t i9rc8fi2q4;tis 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 will citai7; 9f28 ktqrim 4be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbitsc p71h-g7yjw 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 the helium to the sps pjg7-c1 y7hweed of the proton?

  10.43: Two ions travel perpendicular jja5 . y*f;/fbbsujc: to the same uniform magnetic field. The ions carry the same charge and have the sbs:c;baj.fuj*5/ y j fame 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 right. It enters a region off.e e b0+ k.k0ytjvfnvju-)(cau 5s/d space in which there is an electriu.s.e y ka b0d5fv/ j) 0ckte-jnvfu+(c 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 constant velocity?

  96.40: A proton of mass M and kinetic energ-f4osoj0 yo (vaora/.y $E_k$ 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 commonlye:1k7a xq/lcs determined byxa/ksclq 1 :e7

  09.27: A proton moves;rf-xmn t w k*,(zkhrxv8ss /;). kvth 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 passes through this region, in what direction must there zfv/n khktshmr8twv;k.x( -r* , )xs;be a component of electric field? Ignore gravity.

  08.36: An electron moves iu gjko) )pdk1 3ju.(cnn the plane 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 field in Region II. What is a necessary djkngu( cuj3))o1 k.p direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge mov+ig +kor8yg wk*3dpgk.wy8 5xc04 cqwes with constant velocity through a region of space congo0kp g 8+ c4. dg+wckyyw3xwkq 8i*5rtaining 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 constant non-zero velocity d8xf.t8 gxb l2iirectly 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 the region originates from an unseen external sourcxlgxi .82bt 8fe.