09.18: A wire has a conventional current I directed to the right. At the instan3i)2 kmckjq 7rt shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at thirmk2)3j7 ck qis instant is

  14.24: For the bar magnet shown in tc rkrk24wtoz x sin8mdm4 u 733f/3n;rhe figure, which choice best describes the direction of th kn32 4nrk4mfr;o 33imzdst x8/rc7uw e magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventio* d0+ilsmnr-c nal current I shown. At the instant shown, what is l d+- isn0c*mrthe direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the,8u ; l:afg l*8zrcafq left in a wire as shown. For the proton moving toward the top of the page at the inslr al au*,:q8f;gz f8ctant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upwarp(-oy1pzcsv 4o)z e o1d 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 heading directly toward it, the force on the proto4(yc e1p)z ovz1op s-on is:

  95.16: A charged particle with constant speed enters a unifo + 3nzaub y0xh 05vtv ob/;5vk4gt*pvwrm magnetic field whose dirut g05z5kh+bvytv* 0;owvbv/x pn4 3aection is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnzo+ykbtq,z * lxz, 0cnbc ,w51etic field whose direction is parallel to to1tq+l,b0yz cw,xbk5 ,nz *zc he particle’s velocity. The particle will

  03.34: A positively ch9z(cwhgy3 +1or ih,viarged 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 the electric forcz3(ri iyg,hwh9 +1vo ce on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero velo)/;u4 zgnlti4 l)xxr rvuow28city 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 regio 4wu/x2 )tloxvrzlu 4n);i gr8n of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released zxps f /y- /zq:im-z1g:sr-b xfrom rest between the poles r-x1zfss xg- q-zp: miyz/ b/: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 asx--a lg k:51v*atv ftjfapb1tl;c)-x: vs(vt an angle of 300 to the horizontal enters a regionpvf* a-tbax1f1svs clt 5v:- ga j-l) tk;:(xv 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 with speed :0sa8: c fsstk$1.00× 10^3\: m/s$ 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 wirl 53f zt amn(,q2;35 ft7azhv1ltx lnth 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 electron travenx z2m1l;ra7hnft t f, 533vtzlqa5 l(ls 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 spe mu qmr jaa*f,s.28tu1ed 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 the seca,.*1jmur 2qfmuat 8s ond ion’s path?

  16.44: A proton moves in a circular orbit in fj ,zyd7*r)mhlz,iv 4a uniform magnetic field B. A helium nucleus moves in a circular orbit in the m,*f,4zz v hld)7yir jsame 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 the same uniform magnetlpst eh vo61h/*dy/4iic field. The ions carry the same charge and have the same path radius in the magnetic field. Whi/hh1v6t4d sploe*yi/ch of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. n 3uxtw*8 e07asyjy0mIt 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 this region so that the particle maintains a constant veloc80 jmyxt*s3 n7 ayw0ueity?

  96.40: A proton of mass M and kisdgn so z .x6:ek- g)kxvty3o( 8e)5mqnetic 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 particles is comm;a ky61d y4qvlz1k7gnonly determined by1d ;k7ank z46q1v ygly

  09.27: A proton moves straight up the plane of this page into a rex)h u9 hwdjs b6x3r+d.gion that has a magnetic field jx6d).hx9rbh wdu+ s3directed 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 through two regio yu;wu707ea: fprt7 rvns of space along the dotted-line trajectory sho; u707trv f :ue7ryawpwn 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 of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a r:cu8c1;e *p xgzc rka:egion of space containing k ae8x1p *rcg::u c;zcboth 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 betweentv) 2bzq0)uj6o83y2vozy j kz two long straight wires. The conventional cu)o) 2qoz tj ubk0286zyv3zv jyrrent 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 external source.