09.18: A wire has a conventional current I directe +jcg8t k,-ay dsco;y.d to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at a8y ytdc,- ;sog.k+cjthis instant is

  14.24: For the bar magnet shown in the figure, which choice besrak4e:by 0 7 ev:k0xsnt describes the direction of the magnetic field at the point P located directly aba : v4ksy0enx k0ber:7ove the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I show 8;. .kju,/fqhokzzlcn. At the instant shown, what is the direction of the magnetic force on the electron that is movfk.k ,z ulhjqz/8;c.o ing directly to the right toward the wire?

  13.30: Electrons flow to the lefu+z6aci7 i9i q 6+goelt in a wire as shown. For the proton moving toward the top of the page 9gz7iacqi6 o ++iuel6 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 wire flows in the upwzl- l: 1rwoxj7j0 z 0lduu1lp)ard 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, thljolj :d rp0w1l)zx 71-luzu0e force on the proton is:

  95.16: A charged particle with constant speed enters a unif ;pk9ir i9jh:rjq0;dvorm magnetic field whose direction is perpendicular to the particl; d0i9 kj9j;prvhiq r:e’s velocity. The particle will:

  98.10: A charged particle with constant velo( apr uiruk 9arr.h b(2*mf8l+city enters a uniform magnetic field whose direction is parallel to the para8 a hrmrupkb*u r(r+f.2 l9(iticle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A n+./ucbq ina mn kj db2uf8j-9,on- 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 trcjf, unji9 /-. bnabqd+u28 mkue 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 velocitex0d,em mfge., rx88py in a region of space that has a uniform magnetic field directed into the plane of the page. The proton movesmmdex x,, .gp8e0e8f r 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 of9jsxxq5m9:e;h r1 faw9qyx*ih f0ka: negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleratia haq xexm w 959:ifr0 1xsj9q;kfy*h:on of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of kahg-oa*6 h* uthe 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 elect6h k agha*-uo*ron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with5 z6mo) kwy(tm 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 obxtrej40hn;4 60a z wand mass m travels at a speed v in a plane perpendicular to a h;exrwj4a6o4 0 bn0ztmagnetic 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 charz+2weaqyc h x4lab 6csf48t 65ge q, mass m, and speed v enters a magnetic field B and is deflected into a path with a radius of curvatu fe44s lzca52yh twcq68xb6 a+re 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 i*kbfu1n7vj 8k n 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 the rabf81 jnvuk7*k tio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uw9,a7t vvobc* dgn*w1niform magnetic field. The ions carry ov7 ,a t*1cgdnwv9*wb the same charge and have the same 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 rig ) 9turl6zm7zyht. It enters a region of space in which there is an electric fiel7z)9 uyt 6mzlrd 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 eneviir5bvzw+ 1e 97vx-mrgy $E_k$ 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 7sps n8cg xdal-aqw; oej ++.;charged beta particles is commonly determined b-d q8a+p; g;o7+ ssl anxj.cewy

  09.27: A proton moves straight up the plane of this page into a region t kzb4wemki7stq56h1kb s+59-pe h-p j hat has a 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 gravi 9ps-6 5h kbpje7s 5-k whmbqi1+t4kzety.

  08.36: An electron moves in the plane of the page through two regions of spai/krx dl,4rz, *n 3zz/i yax1fce 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 di i f ,3zr*/xydraziz ,xl/41knrection of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a region of spih-1s+9cj j +p)szhehdi bfx-+t0 n-bbr1ox. ace conta 9npsb h-b+ t s-+0+xbi f.jchzx-ijed1hor)1ining 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 const vqrli1kc-e,k ibyu co+l.0 9/ant 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 ref./ i+,0kql-ue cc 1 voik9lybrlects 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.