09.18: A wire has a conventional current I directegew;de7 wgb0 1d to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at w we170egdg;b this instant is

  14.24: For the bar magnet shown in the figure, wi2 zw(nq4se2j hich choice best describes the direction of the magnetic field at the point P located directly above the center of thzi wsqej42n(2 e magnet?

  11.34: A wire lies in the plane of the page with conventional curreng//o x (lkhn9ut I shown. At the instant shown, what is the direction kol/n/ xhg(9uof 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 d bqz+h.8qf .df -g3kvproton moving toward the top of the page at the instant shown, wh hbdff 8.d.+-zqvqkg3 at is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long r/ gtyrfs fq2: 1j)un-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 and headin qgtrf2us f1r/-j yn:)g directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform magnetic fiels 80rn2mx(u11ufmc.h aknrd( d whose direction is perpendiculak r1mshn daf.n8um(cr ux(120r to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magw a3/ v+f;pup,gddk4iorlpc5 u2n;x- netic field whose direction is parallel todir +dnk3xpau2p;4;f,p wog cl -/uv5 the particle’s velocity. The particle will

  03.34: A positively charged particle of masszp 6ds xh5k,j- 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 table. What is true about the magnitude of the electric force on tdhxzs6jp,k- 5 he particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constan0oohxgy:;z /et 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 reg0yz/g oh;xe o:ion of space? Ignore gravity

  04.14: A positive electric chae)zoi 8 ,0jm;jojma7 vrge of negligible weight is released from rest between the po;ej ,7a ) jjmovomzi80les of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an 6r:3y bzobwk ,jo2z/yl r/f7kangle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. A/2/zfbk7 orwlyz:b3jy6r o ,kt 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 with o yiizfpsg)9j, 3zy6kh6el8 3stx)a9speed $1.00× 10^3\: m/s$ 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 masf*jmfzbi6h(9,.j o avs 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 electron travels halfway around the circle. What is the aa z(o *i jmv9j6fb.fh,mount 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 em:+jdqws bxonm. -/0 hnters 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 the secondx/s+o 0: m .bmdqwhj-n ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic field B. A hotvv-6c0y;9 1bsv cn uelium nucleus moves in a circular orbit in the same magnetic field. 0vnv9yu;t-bcs c ov16 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 magnet-fq)ia d0a ie9ic field. The ions carry the same charge and have the saq) -f09dii aeame path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively chcr,1l y5cdkg(arged 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 have to poinc,l51y k (rdcgt in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinedxm:3;:tm (v gsy*znj27vntz 3x0f cp tic 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 eleo2)upqbcmob9p+ j f(7ctrically charged beta particles is commonly determined bb)(qc b+upp9j7o fom2 y

  09.27: A proton moves str i z;v mub;v(zmjnf:x0* )a0vgaight up the plane 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, inv)* fbv(zg0zn ;0i vxm;juam: what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plan1gu+lwt r5 ymrto392 ye 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 planm3wtl+2u5ytryg or19e 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 constah +/((9plbgyx 4vx xxvnt velocity through a region of space containing botx4/(+p(9 lh yvv gxxxbh 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 constantptshp0,)pie + 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 f)sp,h t+0ie ppigure. 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.