09.18: A wire has a conventional current I direct)f ey;9qklobgw+y, (qed to the right. At the instant shown in the figure, an electron has a velocity directed to the gwlq ,fb+yoeky)q;9 ( left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choic,.m ui quq6qdv5/ee b9e best describes the direction of the magnetic field at the 9 5q imvq6u/,ebdueq. point P located directly above the center of the magnet?

  11.34: A wire lies in the plane zv kf0 q932;eqmdk3iw of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directk3d eqzkm; 3qf2 iv90wly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as showt9le k2hhoyork7 1ew 27yxq /+n. For the proton moving toward the top of the page at the instaney +yoh7 k7qhe w2r/tlx129o kt shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long ssbe9:mnmq 6, straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the insta6bmq,em: sns9nt 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 co wz0hmmqe1e j2h2w)jxa3 lj5; nstant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particl0wmwz x2qe5j le )jj a132h;hme will:

  98.10: A charged partido,gwm j9.t,4mz(lf xcle with constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particle(odmx4gf.tl,j m9zw, will

  03.34: A positively charged particle of mass M is at rest on a table. A non- zerz9nk1tonf gd 12k/4m fo electric field E is directed into n zo4k/n 9f1f12ktd gmthe 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 the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero velocity in a region of 3eyzk4 y7b oj (5wehw3 w))uhzspace that has a uniform magnetic field dirhow k7ew u5y)3 j)zbw4 z(ye3hected 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 electric charge of negligible weight is released cvd/ 5ql58v96 igr0xu sw,nze from rest between the poles of a horseshoe ma qvidsev9z,n5 6rlu8cxw0 g5 /gnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron movinx)1crwwg4e ia 4d+pv5 g in the plane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page asgwa w+54) 4rdvcpex1 i 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 speeh. ,5-rtkvtedx4a8jnc ( .sn jd $1.00× 10^3\: m/s$ 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 p e2ve:3 +/xwkeaq m9hat a speed v in a plane perpe:x/3av kp+h9e emewq2 ndicular 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 amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and spejd*-zcnfdft4 9 m82 dred v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion had*8 fjzc-4d rdtnm2 9fs speed 2v, while m, q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circu-f yf8qptx8 -olar orbit in a uniform magnetic field B. A helium nucleus moves in a circular qop-f- 88fxtyorbit 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 perpendicular to t/m)cq dqwoux*p148ll i x07aif+ fyw-f2 t v/ghe same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quan- wl1awl*viu mf q/0f diq) xxp4gtf c/o+y278tities must be the same for the two ions?

  02.15: A positively chargedb. 6sg70wjkakzugjh- qp ys2 og94:-l particle moves to the right. It enters a region of space in whi: lsgk- .zuwb429jjgog- 07 k 6qpyahsch 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 velocity?

  96.40: A proton of mass M and kinetic energ89 pei/l+t ihny $E_k$ 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 commonly determia8j 89p3fg7lzf zeym 4ned bym8a7 ef ygf4j38l9 zpz

  09.27: A proton moves straight up the plane of this page into a rel+h t +11eos dpz)yc;rgion that has a magnetic field directed to )1p+ t1ls +e cdy;ohrzthe 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 pamvpp03eh2lbs6. n sb5: w3 sr8n -oqnlge 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 plane of the page (as shown). There is no electric field in Region II. What is a necessary dire b3p-.vpsrs6 lehb:l8wm 5 0n2nqs no3ction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity thrcbf u2;z,/ll *bqi)k jough a region of space c /lc*kb,)l fz2ubq;i jontaining 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 vhvi4)ou+ 5 f3n(pj(hpr-r wzdirectly 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 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. v4pp3 -ozj) rnw(irh5h (vf+u