09.18: A wire has a conventional current I dipc* 0hqmtmxse; y3r53rected to the right. At the instant shown in the figure, an ele0hcysp;*r 3qt3mx m5ectron 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, wf(uw(ni 32aq he 4nq1zhich choice best describes the direction of the mu4(q31 fanqzw2 e ni(hagnetic 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 current r9we 8z0p 9klkgsj81h I shown. At the instant shown, what i kkljw18p rgze90s8h9s 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 prot* uivptarz811ml3qo6on moving toward the top of the page at the instantql1 16v oziu*3r8ap mt shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows ink*ohw)ivc1d *dpujoo4k* x i+ 9ziy; ) the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charg)9vk yziw4opoki i **oduhc*dj 1x;)+e +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 constanta ;2g18yreybp)t x1hq speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The partic1 8b1ar)qep x2yhtgy;le will:

  98.10: A charged particl:)v )unh .chice with constant velocity enters a uniform magnetic field whosei:c)v)u.hnhc direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle;j19buvf mf /g.p q,uf 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 about the magnitude of the mfbugq9.fvj ;,u f1/pelectric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with cone,1qrg k2eb(z8j*;jd m k mbl6stant non-zero velocity in a region of space that has a uniformzql dbr2jk1,e 6kge jb8m;(*m 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 electric charge of negligible weight is releas m)ym9p*4 n5nbjja8m xed from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic f j8am9yjnp4 * xm5nb)mield?

  10.26: An electron moving in the plane of thtv z :be(dm00ne page at an angle of 300 to the horizontal enters a region with a constant magnetic field directvn:( 0 0dtbmzeed 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 move7ld /0. vxaxzghmmbx0-l np0zb oi69;s 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 v in a plane p3v/nzb6tj1km k+ dn i*erpendicular to a magnetic field of magnitude B. The electron follow k nbmz/iv3k6j+d *n1ts 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, .s sm/ qsj *1t0l/epy rrhpj*9and speed v enters a magnetic field B and is deflected into a path with a radius of0*rry1s9 /pl/j ts smqh.e *pj 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?

  16.44: A proton moves in a circular ory*h9k.qcpp*zsma 6 7vv()n g9olg -aebit 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, what is t(6-ql99egvkp som 7zyan cp h*a.*)vg he ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travh-olts (ffy(, ww ns,4el perpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same -n,w w4(,ys tfh(lfsofor the two ions?

  02.15: A positively charged particle6+qb1ypf(sv imw v9a. moves to the right. It enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction doesa9mb pvvws q(y1i.+6f a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass xs)pz8/ 2gtft(ydypiw*o;* q M and 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 electrically charged beta pa9f r d9ge8 76bpqdnof,itgz*0rticles is commonly determined bf0t,b*i978edpg9 qfndz6 groy

  09.27: A proton moves straight up the plane of this page into a region tha4 yg*l8skmz c9t has a magnetic field directed to the right. If the particle is undeflectg y8 mslc9*zk4ed 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 regions of space5yzl :tfl3j; k*xmof8 k7bpk .)nz/nv 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 direction of the magnetic field in regions I and If:fy)7tk k8nn/lxbkzlv5*;jz o3. mpI?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a regioksa7sop 5 0k)/8il tjkq a,z vuv65o7un of space containingvk5q5ko/o0)v 7pts u8kzjs6lua7i a , 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 direvo) . ko p++9ldxn-lcoctly 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 o+cv9+dp nll -k o.)xodirection of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.