09.18: A wire has a conventional current I dire8khsbvm-9-cxo* sm- ;jnb: mxcted to the right. At the instant shown in the figure, an electromsh89xbvj ;o-k*- mcx:-bnsm n 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 figure, which chpnz(q0h l: tm+oice best describes the direction of the magnetic field at the point P located directly above t:np(lhzqm 0 t+he center of the magnet?

  11.34: A wire lies in the plane of the page with conventional curre*p hc7 sp3y c 3bnp8xty1ddpl. h.)(rwnt I shown. At the inrhtx7w c)*pyps ..1 l3dnbch3(pd8p y stant shown, what is the 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 shown1wt / *gna809i+ l.v amqdfl1llgf9 ff. For the proton moving toward the top of the 8.d0al99f1/ +f lqvf wgl1nif m*agl tpage at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long 5(e-plkyzf 2 ev +0t4cu8j0g9avcwxx straight wire flows 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 from the wire anvv8e0kjc9u4awe0g2cfp xzx5 t -yl+(d heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enui gi8i 6.)pkz44zypn/s wjc5 ters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The partic i.ip zwkuy 854cp4jis6)/nzgle will:

  98.10: A charged particle with con5,;c odg50tg(zodd imstant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particltz5( d5gc ,go;ddmoi0 e will

  03.34: A positively charged particle of mass M is at rest on a tabl:((u lfgk ,bdvx):ipae. 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 l , g)f:(xbd:(upvaki 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 inco6kq8 8tr ux +k yxrz7o47,hlg yj;x; 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 tkzqxyhotu ;jrg+r87kx6 ,x8o; 7l4cy he direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligbb ry8n3;y 3 pg9pv,qtible 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 the mbr gt n3yvpb3;, y9pq8agnetic field?

  10.26: An electron moving in the plane of the page at an angle of5)df7 pb:.t rm7ub6a8l04 cclzez knz 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. At6:c.z u4rte0d7kzcb p nml7)b f za85l the instant that the electron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves mveca-/j-j e- b8,a hjwith speed $1.00× 10^3\: m/s$ 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 with08b hl jh0fdq5;)sgt h charge −e and mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the elqj0hh ; l)sdt ghfb850ectron 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 cp9 (4hyqgoot2ck vb ))harge q, mass m, and speed v enters a magnetic field B and is 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 be the radius of th) pqcoyvgh(kb92)to4 e second ion’s path?

  16.44: A proton moves swzkzh l)z + 9jvffi.p;fd269in a circular orbit in a uniform magnetic field B. A helium nucleus moves in a circulksjv +zzfd)f;lw p9z6hi9f2.ar 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 speed of the proton?

  10.43: Two ions travel pyfrp3x+r :jml1+ e 1lwerpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magneticwp+rl 1xmj1y+ f3lre: field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the righ1 7mo+g zrl(6r/rzk :skk vy2g hg.8gst. It enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In whic +:kkzg(z/61sm r.l7h ggkysgv or 8r2h direction does a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of majvai p)z+ stbc:c )hnie8yae; g(:- 8bss 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 electrically charged beta parjs3l ds ha*p2w(i v4u/ticles is commonly determined bd* wa hs/u42i3l( jspvy

  09.27: A proton moves straight up the pla3t5h5cmn.fag-b b0 dgz1hwl8ne 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 whab m8ac3b-wf0 g5dg n.l5th1zh t direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in/l/)1l bn wkzg the plane of the page through two regions of space along the dotted-line trajectory shown in the figure. There is a unifg// nkbwl zl1)orm 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 velocity thro4 ;tpubfc 04oc ,4msop 54tyjeugh a region of space contai5tt;cb4p smu 4oe,c0jyo44p fning 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 dir-ee + *8cb9l0j yhel (3jjtsonectly between two long straight wires. The conventional current in each wire has the same ma+s-( 3ly8j ecljn 0*othb9ejegnitude, 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.