09.18: A wire has a conventio.0b+r unqn sn+xn).td6d4jhjnal current I directed to the right. At the instant shown in the figure, an etu0 .qdnnn4b.n h x +j6)jrs+dlectron 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 choice best describes bh1a2ni t 5r m 8.ss.jpb.uitw49lcc*the directi4ju 8si. ws2.t9itrcp hbn5. 1 mbla*con of the 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 conventional cur.l27b*ug(ic1alxbpf rent I shown. At the instant shown, what is the direction of the magnetic force cblxfbupg(21 a i*.7l 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. Fsjiblw ,)p6 l0or the proton moving toward the top of the page at the instant shown, what is the direction of the magnetiis,jb llwp6)0c force on the proton?

  94.30: The conventional current I in a long straight wire 4;u ;w; 6i+ms rfvs-e v/vtxpe,gb9pt 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 anvu;pbev;pfmes4 6i;w 9-xtg t vr,/s+ d heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform magnetic fizzfz84/ksv(y*+,wr3zbfv7, p r dhmweld whose direction is b v,z /7+f8mzwky43 wdfvpsr (,*zhr zperpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magneticcr2qxydoz662c.vv v o1j3gn4a l 8v( y field whose direction is parallel to the particle’s velocity. The partiloo d2yvgac32y(61v6n 4 .8qxvvjcr zcle will

  03.34: A positively charged particle o/d en rp35ugz-a) 9lqqf 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 tqe3 n9d)lp/u-aq5zgr he 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 spac a t2uiifd)17ee that has a uniform magnetic field directed into 2)editufa17i 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 i o2 ax(:lblib3 qz nq*s3;gxx -1kis3ps released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused sa xos2 :-i;1 zgkb(b*nllxq3 x3q p3i by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 3k5bwg m0m/ 4om4kkn: h00 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 magnetic field, which best describes the direction of the resulting magnetic force on the elect hwk04:4nmmkog/bmk 5 ron?

  11.29: An electron moves w)y-c s wrljeig 26q,z;ith 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 spemgcawe+- 7o d;ed 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 the amount of work done by the ogcew; -m +d7amagnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic fiecl52,fbk3b: h0ge -p s/yss3 ijq(cy dld B and is deflected into a path with a radius of curvaturyp53 fhsglj 2syb-:/b k 0,dcciq3es(e 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?

  16.44: A proton moves in a circular orbit innbt md:qq7.k0 5rl)ec a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same m kbq.)5dc 0:er7qt nlmagnitude 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. Tr7jepkt :zp 9w(n9) exhe ions carry the same charge and have the 9etwj rep:kn(p z)x79same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It1)nbcn4n/to l 7gimh+u+ k s4j 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 constanc ok+h) i7ntb/js144umn +lg nt velocity?

  96.40: A proton of mass M a dpy4mla u(c01 aaky+x-09 kufnd kinetic 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 electrie22n4i+/vmvl p2r ygcs o8mc 9gm72 glcally charged beta particles is commonly determined b7r2v gcl9 v msm ielpm2+n2g2oyc/4g8y

  09.27: A proton moves straight up oo 0y (wi;xn0 uhqd-(othe plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction must t( y 0 do-uq;xwo0oin(hhere be a component of electric field? Ignore gravity.

  08.36: An electron movl(7r /c s-dhqvs*mf u7es in the plane of the page through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region /crm7ld sf7h- s*quv( 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 thro8f n hvd)c5ujm4qx6xfy9: k60; ehqtcugh a region of space containing ; tkqchfejud vmyc0856n9xf ):4q hx6both 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 constaux ymk1 k4f/i)nt non-zero 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 figure. Ignoring gravity, which choice best reflects the direction of the magnetic field and thek uki /x1)mf4y 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.