09.18: A wire has a conventional current I directed to the t6z, x1z9f f4fev3 nddright. At the instant shown in f6d9vzfx1enzf d, 34 tthe figure, an electron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which cho:byvu w93 9 hf9hbkd9yu k)te72snc; zice best describes the direction of the magnetic field at the point P located directly above the cen9k 29f; n9usy)9hdb:hkv 7z wybt3eucter of the magnet?

  11.34: A wire lies in the plane of the page wit9ys .i8z+t7 yag o, yy5qo-prdh conventional current I shown. At the instaoy aqy r5gzs8y9,+7idy p-t.ont shown, 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 /vv/ank:segr:8vea2yq,r1s j+ ui7 o a wire as shown. For the proton moving towardn: ,/jvr srk7iaye /aq :2oev8sgu+1v the top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wiiq1wse uv6ot 5a: 3mu8re flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a prot 135: vewsua86uotmiqon 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 constant speed enters a uniq /,p7 zo1z yqum(*ebnform magnetic field whose direction is perpend7(eo, /zqn1 pz uq*mbyicular to the particle’s velocity. The particle will:

  98.10: A charged partivrc 7sox+94fkc03q6rq ih. j bcle with constant velocity enters a uniform magnetic field whose direction is parallel to the iqc7jr kh f.csrx9v4b6+o0q3 particle’s velocity. The particle will

  03.34: A positively charged ,huk3 xjn ro19particle 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 jkxn o,r3u h91about 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 at1t.j5i3,klxkj lf m )xaa;y/ region of space that has a uniform magnetixf.ya,5;klk/x a 1t jiml)3jt c 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 electric charge o 7z 1nq:c6svl 2mnp:pof negligible weight is released from rest between the poles of a horsesho 7n :mqs1:novplp6cz2e 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 ohekw7a aau; uk36l*n3 f 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 as shown. At the instant that the electron enters the magnetikwuk3ul a6enah a3; 7*c field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron mosk 9afq rkpru,43yy 9 l+6m.elves with 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 speed u/ h9 cy.pvaxe/0ns 0wv in a plane perpen/0np/w v ecxh yus9.a0dicular 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 speed v enters a magnetic field B po(6e4m9 puz61jz hezand is deflected into a path with a radius of curvature R. If a secoz6meh ue1j z pzo496p(nd ion has 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 circular orbit in a unifjg4 z/dy w.imt ;9hm3jorm magnetic field B. A helium nucleus mo.;wyg4m3j/thj i zd 9mves 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 the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. The io rbw .ejvnw9 d/6v/s9sns carry the same charge and have the same path radius in the magnetic field. Which ofv dvs.9b/es/n 9ww6 jr the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a regij by 8jsb-no -8(trkw;on of space in which there is an electric field directed up the plane of the paper (see figure). r(j bb-n;8jw yt o8ks-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 k,0qs crzql dmy9784 ovinetic 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 cx9j i ub rl9n6bl gd;nd(op2*a)i -ws5harged beta particles is commonly determined br29*pxow n9bj (isln)abi5dl6u- g; dy

  09.27: A proton moves straight up thep0ua;tv-b g w+;byf-k plane of this page into a region that has k;;f0vgp- abw t+-ubya magnetic field directed 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 reg7oq w elvw; rsdj)9,(fions of space along the dotted-line trajectory shown in the figure. There ij(dw e w svolr9;,fq)7s 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 chtxi ,g,1/hbkjarge moves with constant velocity through a region of space containing ,i,tbkh jg/x1both 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 between twounvb 3kl)ch 8+ long straight wires. The conventional current in each wire b huk+vc8n3) lhas 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.