09.18: A wire has a conventional current I dda wmk0d l 1,fyj9ji2+irected to the right. At the instant shown in the figure, an electron has a velocity directl, ji1 y+ d9mj0awk2dfed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figb fikr y 9ku.yb2mf2- 3;ur.pzure, which choice best describes the direction of the magnetic field at the point P located directly above the centerrfukr9 b-z 2 kpiu3y2m..;byf of the magnet?

  11.34: A wire lies in the plane of the page with conventional currentt87gc32idbn e I shown. At the instant shown, what is the direction of the magnetic force on the electron thaet 82dg ni37cbt is moving directly to the right toward the wire?

  13.30: Electrons flo cd hk0t7cubr/a7*f64r qa)ygw to the left in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of r uc*aqgr 07h7k4ac d/)y6tbfthe magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows i,ox d6ewkzh)-n the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire and heading directly toward it, the force on the protod -xhewk)6z,o n is:

  95.16: A charged particle with constant speed enters a unif oos4a m6s4eh8orm magnetic field whose direction hso4oem6a 4s8is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with consta8*j1+cva ui.zg6 wj1 gi*f rnsnt velocity enters a uniform magnetic field whose direction is parar* i6g1g*. fs+vnc iz8aj u1wjllel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is a/hklrqy /e3)ho hib3 ;t rest on a table. A non- zero electric field E is directed into the plane of the table. A non-zero hh;oy3q3/ r elhkb/)i 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 constant non-zero velocity in a region d5ep vfy +2:tcof space that has a uniform magnetic field directed into the plane of the pe2 ptdfvy+c 5:age. 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 awkm/, 0 pilk1of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the0aik/ , lwm1kp magnetic field?

  10.26: An electron moving in the planz/:j ;plsc,b ge 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 magnetic field, which best describes the direction of the resulting magnetic fzlc:,gsjb ;/p orce on the electron?

  11.29: An electron moves with sp kw2./8tequfp eed $1.00× 10^3\: m/s$ 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 plaar(a y3xm:dhq+ op 0f+2 mzu0rne 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 circle. What is the amount of work done by the magnetic force on the electron in this time032x+( z oqyafum:0 marpdrh+?

  97.28: An ion with charge q, mass m, and speed v2iwjzqwkgqu 90wd9 *6 enters a magnetic field B and is deflekqwd *099 gzuiw62q jwcted 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 be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetir+4rgklir8pft1n :r7xd6+ )vsh cvp *c field B. A helium nucleus moves in a circular orbii:d6 1rvtr+*nrl ks)p rgh4+xp 7cfv8 t 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 the proton?

  10.43: Two ions travel perpendicular to the samcvad8 .r+p d/ue uniform magnetic field. The ions carry the same charge and have the same pacud.vp +/d8r ath 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 en:z94n*zk: l/oiha kqo5rv 6 gcters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which di946 cogzl5/vhk*ia r:nq ko:zrection 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 energyye4eir1q+zb: l0 2ayb $E_k$ 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 commonly determined wdon( *ova0d2m0 qxj -by0 qx vmwd-*o0(ad noj2

  09.27: A proton moves straight up the plane of this 98 h0yxyo pga*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 directio8a*x9gy0 p ohyn must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the planera( oc t+cnho3s jyuv4 3/-i/x 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 necessarx4ivtoc+3j-suy(oh/3n cr/ a y direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge movj-oq3wqn k9pm i5l ;h,es with constant velocity through a region of space containing bmi ko9,plwh3-;q5jn qoth 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 ajltuy 4k-4su1sxf :k8t 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 direcxsltkyk us8 4 fj14u-:tions 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.