09.18: A wire has a conventi;(2:v; n,ge ymopk h9j.kew ironal current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on (e., np2 m:rhyj v;;ei ogwk9kthe electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best xu b 1kuzey;l,.0kca) describes the direction of the magnetic field at the point P located directly abovey; )lk,bxck0 zu.au1e the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I sho +.bj qd7m2yr;u1cj4 - ersgluwn. At the instant shown, what is the direction of the magnetic f u jcj+l1g4qm.sr y-er2u7b;dorce on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the lg5nf4 mx* dpc(eft in a wire as shown. For the proton moving toward thcmd4p *fn5 gx(e 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 9m:pwuiaf x x: 5n:9nqin 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 a distance R from the wire and heading directly toward it, the force on the proto:q5:a9n9f pn xu:im xwn is:

  95.16: A charged particle with (0 1:j-xv6kj tdv lcjpconstant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The parkp -l0xvdjt1jjcv 6(:ticle will:

  98.10: A charged particle with constant velocity enters a un s.3m3ep wi-uiiform magnetic field whose direction is parallel to the p3u.iwm pse-i 3article’s velocity. The particle will

  03.34: A positively charged particle of mass M is at )vwbd1y;e til 5n u4 (nfka1p1-wqs( vrest on a table. A non- zero electric field E is directed into the plane of the table. A nonq;4il-t1yu1b v(5dnfank1 e(wwv)p s-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 cvj*jx;hlgv23/lw9cy)p s4 wz onstant non-zero velocity 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 o wwvjvc2hl*p )x4jgy /sz; l39f the electric field in this region of space? Ignore gravity

  04.14: A positive electric chargxv2 l- ;rstjuz:o9 xr,e of negligible weight is released from rest between the poles of a horseshxj2 sutrl z 9ox-v,:r;oe 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 +4wpiyl/hi imy 32m4pj(0nbd300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. At the inst+ji0myh2y4 bl 4(idm/pipw n3ant 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 2kaeaa,r zb4-fe z*xv).g 0is $1.00× 10^3\: m/s$ 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 charge6nij v o:hd.4h −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 aroundo h64i:hn .djv 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 ev,onuqc w m3x )h-,;no(8itqenters 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, no u ix,etq,w8nqco)3m;v (h-what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a 00 n4mau2wjezs.:3+:r z85qf ym,vdi pcboxe uniform magnetic field B. A helium nucleus moves in a circular orbit in the same macmq3.bezdpj4,a +z r2wsiuo8 :vy 0f5:xm0en gnetic 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 travelf7ccz /gx3 sc, perpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Whichxs7,/z3 cfc cg of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the o ;f,gtvfgemm5c 3 y8f0gy3n3right. It enters a region of space in which there is an electric field directed up the plane of the paper (see figure f,3v3tf0o5 m;emycfyng 8 g3g). 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 energy sxz.ugplpkn2wzfv 0 -t-,7xz6t )0hc$E_k$ 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 determi2v8ufdxd(6ix ned bdfu ix (dv68x2y

  09.27: A proton moves straight up the phllp0b tjc qv( ia8s4tg(7.:vlane of this page into a region that has a magnetic field directed to the right. Ig( vtbl0sv p4h7j(la8iqt:c. f 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 jy4it+zc/ f - 3m7s2- mnqzqccplane of the page through two regions of space along the dotted-line trajectory2cicz4s/q -3mj fz-mctqyn 7+ 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 direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves wu:rp;u4 o4k 9vs ekm7hith constant velocity through a region of space containi:7vpok s;hemur9u44kng 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 directly betwr;cl3,olxe) yb o j)(uhvd x*:een 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 lxboe)c:ol3),xj(vy *u ;rd hexternal source.