09.18: A wire has a conventional current I directed to the ri8)svnt;(bd ke d 2kb 9rghu/-hght. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at thi;d hkg8)v b9/hnt(rdks e-b u2s instant is

  14.24: For the bar magnet shown in the figure, whi2y:s xa4u44zu +hnzwz ch choice best describes the direction of the magnetic field at the point P locatedy 4z4u+wa z4ux nzs:2h directly above the center of the magnet?

  11.34: A wire lies in the plan 2tu)v2tj*d)f*m tckx e of the page with conventional current I shown. At the instant shown, what is the *cjx2d2f) v*ukt t)mt direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving wom+ s(f8n;a:imv; rytoward the top of the page at the instant shov:frw mys8n; ;+oaim( wn, what is the direction of the magnetic force on the proton?

  94.30: The conventional curremq 0u7uz7sm6jtk0z2 vnt I in a long straight wire flows in the upward direction as show7jus6tm2m7 zuq0kv 0zn 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 proton is:

  95.16: A charged particle with constant speed enters a unifocjrey3k y9c8, rm magnetic field whose direction is perpendicular to the particle’s kry9,ec8j3cy velocity. The particle will:

  98.10: A charged particle with constant veloci ttutpnv7vi93;a;t: uty enters a uniform magnetic field whose direction is i;vvu3tnt;97 :aptt u parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on m y 3d88l7lakfa 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 magn lf7amy3kld8 8itude of the electric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves withjgsyh 3wwc 85eb1i : zzz*dm0u.)v*yg constant non-zero velocity in a region 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 electric field in this region of space? Ignore graviius:d0gw8)zmh 3*vz*. yz5ybe1wc g jty

  04.14: A positive electric charge of negligiblm +m2l bo( mxh4 ,zxf6 ne:d4-xwbn7nae weight is released from rest between the poles of a horseshoe magnet as shown. What would be on,4 4:2fnxlazn7mhe+bw 6bm (x - mdxthe direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the pa/v6 56jbr9s * svjn8xzwu9txcge 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 force on w69*jzjbcv8 tsxu sv6/ nx59r the electron?

  11.29: An electron moves with ac78ao08osibmb3i8 kspeed $1.00× 10^3\: m/s$ 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 di9jr3874 zcfie7x uuah1 0ddhb e y0u0)n.xgand mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular pathu7r 30y19u .ed fx)ng0bix 4j 7dhc0hde8uiaz 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 c)gjqg4v z 3qn174 gw2z(8( rtzmwctsand is deflected into a pa8zm7qgv) 1ct st(gr( gz42 jwzcwn34qth 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 circula 5no;kffrv/andr- -/i8r .hsbr orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit5ak r nb/8dfrsn/hvfo-.i ;-r 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 thkc6t:yqi,:m)cou6 o l t6 elp0e same uniform magnetic field. The ions carry the same charge and have the same path rad:tq6l) y: kc ,6utmcpioo e60lius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged parh4n -hsi.rm. + woz5veticle moves to the right. It enters a region of space in which there is an electric field dir n5e or4- h+hsw..imvzected 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 massgvp r,8bu a6p y,xoe24 M and 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 electricvo ++:nj uirbo )w36wvally charged beta particles is commonly determined bybjv u)n6ir3:+o+wv o w

  09.27: A proton moves straight up the plane of t*7yhde:+r4ii n kbv.dhis page into a region that has a magnetic field directed to the right. If the particle k r.bi47h i*vy:den+dis 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 f+kebv(i0s0es d -j:kpage through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Regio-0k bedj visfs0k:(+en 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 copar dn0 1fbej9mdaomf9b 2. vbxm3:)9nstant velocity through a region of space containing botb1mmd.3e 9o0bd nmb ) vxa9f j:af92prh 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 )otv3yp -tzzkam4qd2;n, p/t velocity directly between two long straight wires. The conventional current in each wire hpdyo;z tz vq,2 3n /tpmk)at4-as 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.