09.18: A wire has a convent htwv8p,d:7t pional current I directed to the right. At the instant shotpd8,p7th w :vwn in the figure, an electron has 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 figur q-4bu9tnmsp yq;i6g; jxg 78ne, which choice best describes the direction9qq 7 s n4-bt6uyg;ig j8x;mpn of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the 2vq0569m2 qnrkmglx jpage with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electrornmvkj2q m6g l590x 2qn that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as s/ inuja/ / 7kvht9lgv-hown. For the proton moving toward the top of the page at the instant shown, wn/7hilj-u g at9v /v/khat is the direction of the magnetic force on the proton?

  94.30: The conventional currequc0ksdqus-(5j ,* (o yt 4cewnt I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downw0 kscyo5j4*uct(,s( e - duwqqard.) 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 uniform mag-5 lhhc)e(7e r pmd)up9-lyl pnetic field whose direction is perpendicular to the particle’s velocith)p9l()-p pr7melc -y5 uldh ey. The particle will:

  98.10: A charged particle with constant velocit6(miq:m 0ngr;*j t kmgy enters a uniform magnetic field whose direction is parallel to the particle’s velocity. Thrgjm;6kmin*t qm0(g:e particle will

  03.34: A positively charged parbdgcr 0r2y(1pyiqr* 3 ticle 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 tablr qg*p2y130r d bry(cie. 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 co: mb9*a00g af9jq3kr-9dbwqi, j uzwanstant non-zero velocity in a region of space that has a uniform magnetic field directed into the pl399* aq0-b 9j:iwumwrkgb, afzqajd0ane 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 weight is released fr5 z*m zq-mdp/dom rest between the poles of a horseshoe magnet as shown. What wo/q*dmzpz -d5 muld be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the p3sz1km;axuakp 2t// j age 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 pkz2 m3k/1xt ;aasu/j force on the electron?

  11.29: An electron moves with speed zv:f*yoza/3 cx) rb4l xn, 3ns$1.00× 10^3\: m/s$ 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 insz1hutz14mi0wr (0 xd 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 circle. Wha (01m0 wi d4ts1hruzzxt 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- wub/j u1hxp1 field B and is deflected into a path with a radius of curvature R. Iuhu1w1 x-/pbj f 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 magnetic fiel f odjcfn22 k,5bcwofvzh5.5l(w km.4t 6.wr gd B. A helium nucleus moves in a circular orbit in the same magnetic field. If each2 6 fo4,hz 5w5nj5k klod.(.mftbwwgc r2fcv. 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 trav07v(jg okwwhwwwk, *:el perpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantk:0j7 *w,hw wg (wvwkoities must be the same for the two ions?

  02.15: A positively charged particle moves2+gb:n-q*m* wtjaogs to the right. It enters a region of space in which there is an electric field directed up the plane of the paper:am-*gtq*+sogn b wj2 (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 kinfc( sn*e;vqw.lf6+f l:d)nrs etic 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 electrically charged rsj 9ahbp v(jvc0:n32beta particles is commonly determined b9pacj 0vsh( b3jn :v2ry

  09.27: A proton moves straight up the plane of thisne ryl 1jfxc0+u )7b8dlpru (/ page into a region that has a magnetic field directed to the right. If the particle is undeflected as /lnc0+ r8rbyej ( pu7f )1xudlit 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 page through two regioj+1 rxd)zywz 8t i/wk,kasw6:ns 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 direction xw)kz :+ 8ditsk,r/yw1w j6z aof the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity thro 9xtq/le oe )-,pk;ibiugh a region of space containing both 9ip )bk q elo/,itx-e;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 constanto4 hexnci6r 4x,d*mp) 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 electhecx* ir) m4x,p 6nod4ric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.