09.18: A wire has a conventional cuv, w;m zr6z5wyrrent I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. Therw ywv;6z,m 5z magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, x;;,yzzbu e )dwhich choice best describes the direction of the magnetic field at the point P locatedz;;e, zuy )dxb directly above the center of the magnet?

  11.34: A wire lies in the bwqxgfzxbla/ 0us +/-e 8(f: aplane of the page with conventional current I shown. At the instant sxb a: f- 8sf(zwx/ lb+0gq/eauhown, 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 shown. For the proton movi4aa.e um*k2r x5b ntqeijnj4j13z/ l*ng toward the top of the page at the instant shown, what is the direction of the magneticmn lku4xe1ba*q 3.n zj2t4/e*i5ajr j force on the proton?

  94.30: The conventional current I p 3pncnu:/ zc9in a long 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 /nppu cc:9z3n 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 magn7jxb2rg /rtu.etic field whose directiong 7jt.u2rrb /x is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with coqh.mi(4m lar7*vdx* gnstant velocity enters a uniform magnetic field qa *r*l4mmhg7.( idvx whose direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged v16s 0sl8oy1:n fxaml particle 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 table. What is true about the magnitude of tfl 08yxl:6sva1sm1 on he 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,tw-h/;q (lgk cqeo8t ero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly upql,8w-hctk ;eoqg / t( 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 from rest be or 6wztul0o124 0cp raddp0 9yta98xrtween the poles of a horseshoe magnet as ow4tpc 6y o01rrl80p9axadr09z2tu d 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 angle of 9s b)z e.orfh7 :e0twm300 to the horizontabmhe7weortf s: ).09zl 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 the electron?

  11.29: An electron moves withr7hcjk2ig5tb 4n/:ctd8(yu 1vanm + y 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 with charge −e and mass m travels at a-.3bw+zmk j z;c lpm*kwet,z9 speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius.z 3+wjmk;-m zkwe9,zbt*lc p 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 cl )8o 2dfbidpsj)88b +,dful 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 fb8fs2 oj)d l),8d8pic +dulb unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a ,f* w3 l)zufupuniform magnetic field B. A helium nucleus moves in a circular 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 w ufp,)uz*lf3 the proton?

  10.43: Two ions travel a 4+q2d3h ;twhyuv6 hwperpendicular to the same uniform magnetic field. The ions carry the same cwqw42h3y6 a+t h;hvudharge and have the same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. (f ynjwn m,hhn-wd5,8It 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 point in thism nhwfn,8 (jd,5yn-hw region so that the particle maintains a constant velocity?

  96.40: A proton of mass 92q-fcisx ,3 rpy vuo6M 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 p ;w2wq4ku 4dq rak25kfarticles is commonly determined byqkuk fr2w2;ka5dw4 q4

  09.27: A proton moves straight up the plane of this page into a region that has sr u*(:fpoax*v7ji4f- tkokkrt -,0la magnetic field 0-o,7st lfjr*o:r*k(kua t fxi -kpv4directed to the right. If the particle is 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 page throughpn44l czok. 8)eh6xlh two regions of space along the dotted-line trajectory shown in the figuronz)phe .4ck6xl4 h l8e. 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 wit:(ieiracrdpgt 9,o38 cw/in8h constant velocity through a region of space containing both w on3c9r8ci/p t:gie8,ir a d(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 directly betweeur.t 0.wl bvk9n 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 electric field that exist at the location of the electron? Any electric field in the region originates from an unseen exter ..vk blu0wt9rnal source.