09.18: A wire has a conventional current I directed to the vf;eik7(/uxql- 0i 2mk yct9 bright. At the instant shown in the figure, an electron has a velocity directed to the left. The ukti cl9(vxqbkimf 2e7; 0-y/magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, whict 7b i0ce+hdy*h choice best describes the direction of the mag+diy7htb c*e0 netic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conven(* v;ck;ddgail4 * hgutional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly u 4lci(gk*vd ;a*hg ;dto the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton oe/ eqx1x5+g9li, x hrmoving toward the top of the page at the instant shown, what is the direction of the magnetic forlxe +q5ieghr1 9,x /oxce on the proton?

  94.30: The conventional current I in a long straight wire flows in the upward2zflq6*sjo8/1 nyo s , q y5*cvng/dpf direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e ic/s vdny1f*8 y*n,soq6pq5jfzg 2 l/os a distance R 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 fied2;nik4bgnw 6 o;zi l6ld whose direction is perpendicular to the particle’s velocity. Thdn;zo; ib w i2lg66kn4e particle will:

  98.10: A charged particle with :t if(( o+qvk-tabqt8constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The -bk(vq(8at: +t tfoiq particle will

  03.34: A positively charged particle of mass M is at rest on a table. A non- zn5vg7 tq-tqk: ero 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 tabnq gttk: -5v7qle. 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-z:a m7i w 5mfbm v/v-l5*(nmdraero velocity in a region of space that has a uniform magnetic field direci*mbmd7vvw a-amr 55(:lf/ n mted into the plane of 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 weic-6 mwmay 3 :grbuzujw62 s*3fght 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 2 j asrcgwbmyw:m3fu6*- zu63 the magnetic field?

  10.26: An electron movin1 nqv5b ;+ajhsg in 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 magnetic field, which best describes th1+n a;vqbjs h5e direction of the resulting magnetic force on the electron?

  11.29: An electron moves with spefq 3nstti0mt7(9 rnr3ed $1.00× 10^3\: m/s$ 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 plane pwf 18 fl5*gzyherpendicular 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 bwy 1 *85lfgzhfy the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic f9tbdb f zz3*qmtzu+ ;s 3+us6d.byyt -ield B and is deflected into a bbdtz*-+ ssz 3ufu.z 9y+tbt q;3ym6dpath 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)u ojk*s v+su* orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in thjuus s)+ov* *ke 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 same uniform mageuly5q 2 1t;bonetic field. The ions carry the same charge and have thb52oy qe;1 tule same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively chargpwqjx j4g-w75ed 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 hajwj q7pg w-45xve to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M andxn+ uissr+ )2oev 5iv4 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 electricallybods wi80r1f f(uj t74 charged beta particles is commonly determined by r8 0ud1jiff4bwo7st(

  09.27: A proton moves straight up the plane of this page into a region that has 8cb 9zu5x1 qrh+v.rzog,omb6 q-yr, qa magnetic field directed to the right. If the particle is undeflected as it passes through thioyb8r1z5o , .-vc9+qr ,rqhxzguqbm6 s region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron movesx1; 52bkl*ukxhxn*mu 9d0oni in the plane of the page through two regions of space along the dotted-line trajectory shown in ok*hkix*lu;numxd 9x2n b015the 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 II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant (5wiagel6,ze 3jfua2 velocity through a region of space cfajzu l3(i56w,e 2ae gontaining 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 n t+q8ngrnhr dx47(4xpon-zero velocity directly between two long straight wires. The conventional current in each wire txnp r8hdg 47(n+4rqxhas 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 source.