09.18: A wire has a conventional current I directed to the right. bg2qc f)z: xdh -xe45x;vin8gu:4z sdAt the instant shown in the figure, an electron has a velocity directed to the left. The magnetic ff);icduse -z g4n:8:bzqv x dxh25xg 4orce on the electron at this instant is

  14.24: For the bar magnet shown in the*b5 2j+5)f:j j)rgjau bfm l2fyf+u-bvpd*jm figure, which choice best describes the direction of the magnetic fieldj:)g++p2mua *bbmfjb2-jf f5 fy j5r)v * jldu at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of t 5p99cgjhb b7hga+x,r bqs/h,he page with conventional current I shown. At the instant shown, what i, rbbb j79q+gxsh/5,pca 9ghhs 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 moving towagixs/, k n9 skrh)si,3g,iww:rd the top of the page at the instant shown, what is the direction wn,9 ixssh wr, :kiig,kg)3 /sof the magnetic force on the proton?

  94.30: The conventional curren1hzt 7jd3e5s9 -.bmyq8c kddlt I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.).7q t dldb 8dsm3cyh91-5jzek 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 const 6d*ob p-.gvh0n +7kqqlbyen (ant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. Th+*6 lvon-.qbb7 dqhn 0ygk( epe particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic fiel , uy)z9c7twazd whose direction is parallel to the particle’s velocity. The partaz )9wz7ucy,ticle will

  03.34: A positively charged particle of mass M is at rest on a y8nwytewmr: c y)t4 7(f/ 0gwctable. A non- zero electric field E is directed into the plane o c wf:e8nytm/y)w0 w ycrt47g(f 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 the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constaab ch( 5tr;g4tnt non-zero velocity in a region of space that ha4gb(5;r at htcs 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 region of space? Ignore gravity

  04.14: A positive elec2-+abdcip ny;tl*d3wh5o q:f tric charge of negligible weight is released from rest between the pole;yq*cn3da d- 2 t+of p:w5ilbhs 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 angle of 300 toaqu3 jrkqliap(-+9 + bx)+igl the hor 9 -gx+lrpki+ uj)qa3+l iaqb(izontal 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 with speed wh y zm,+mbfm)4b )-wd$1.00× 10^3\: m/s$ 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 cs1cm(ukgs ur;l3 jx;8harge −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 travels halfway around the circle. What is tc; uju1m3gr lk8s ;x(she 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 magn rsriq 0e7:hk rh0s-2u rrf,d;etic 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 second ion’s path?,i uer-k dr2 hqs0f0r sh:r;r7

  16.44: A proton moves in ;ba5d6b eq+dgzp5v5x, zya; ta circular orbit in a uniform 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,byadz dp; et z5q,6bv5ag 5;+x 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 magnetic fiels jtr9.g 9tvfx.e;c-+ 3begcdd. The ions carry the same charge and have the same path radius in the magnecde;9tr9 cg. s-gte3fjb+x.vtic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It hlw ph9 4iel i fs*/i3jmgo *kn6n(4o6enters 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 thi6oii 946l lg3nh*ish4w /n ofpkm(ej *s region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinj aun)v o79 e*ve1c osh:rf)-aetic 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 betmv80*h ubcr q9k4y/)8 euoioja particles is commonly determined brymkb4*v ohq 9i /c8ju8)eu0o y

  09.27: A proton moves straight up the plane of this page invw5 r pd9z3yl js5q8p(to a region that has a magnetic field directed to the rspjz35y vdlq(58 pr 9wight. 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 re kib71 9dvj,hm4sahn5gions of space along the dotted-line trajectory shown in the figure. There is a unimh4 bk5s aji,vnh1d79form 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 ta/2*dr 8brbw);u6 f.aumg sx ihrough a region of space containinsw*ab2u udr r.f /i6bam g;)x8g 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 vyws,e27pka us u83ilfs; i/; 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 figur2;skiip s uu flay;/3sw78ev,e. 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.