09.18: A wire has a conventional current I directed to the right. At the i;z419poxucyhi 44ykpnstant shown 4k icy h4y;z49up1xopin the 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/wuk;0e6iy3 9c h5lf-iudggb, which choice best describes the direction oe -cwk06d;5 b lygi 3ig/uuf9hf 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 conventi+w; s(v:zi c-viuplw*f-k-cvix, p d0onal current I shown. At the instant shown, what is the direction of the magnetic force-(: i-ix+lk ,wvc*0dzcu;s-i v w fvpp on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shownw2dee72laj+ t. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic+la227dj wt ee force on the proton?

  94.30: The conventional current I in a long straight wfx6j6xa4bcu -ire flows in the upward direction as shown in the figure. (Electron flow is downward.) At j6c46bx-xfa uthe instant a proton 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 uniform mv xod12og -4 jfglr1ac9:k07 fm*ifupagnetic field whose diremx1l4-af7kg2 0rdg vf1cip ujo:9f * oction is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particl 8i:ntneylxw*ksc0c)1kkowe0 /gol) c7. h, be with constant velocity enters a uniform magnetic field whowcksn1k cylh0gnc8ex*ot o 7 eb)./:l0,iwk)se direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A nom+0*w .e8wegqt9x ul t+mb g6bn- 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 electrmgu+ tw8qb0 b *9l6.m we+egxtic 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 regi2w/ a jhn()ougam4mg(on of space that has a uniform magnetic field directed into the plane of th(mj am4 ng)wh( oua2g/e 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 375 zs r;lvii:b6jjq vis released from rest bet7b;rz : s35i vj6lvqjiween the poles of a horseshoe 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 plao a:1wb4 h8vgene of 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 magnetic field, which besta84ewb g:vh1o describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with spez6vq/2e + imeced $1.00× 10^3\: m/s$ 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 planl0air6 kz g1k.e perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the eka . rli06gk1zlectron 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 qc(uq9u1f mv4 b, mass m, and speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ionmbu1ufv q4(c9 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 uniform magnetic field B+0sjh9 vg-*8 cg wd;1fv77gno ipxg nl. A helium nucleus moves in p;7 +gd oni8g 79l v1xng*jsg- f0hvcw 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 s 6m9fcrur.6nk8xo.m 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 follow m.ou96 nxr86.cfrsmk ing quantities must be the same for the two ions?

  02.15: A positively (/a2uy* awixtcharged particle 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 does a magnetic field h aiyut 2xw(*/aave to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass o5(.e /nf3dkzjcmy 7q-fnh g/ 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 5 6lbd)5q, e,rw rnqiicharged beta particles is commonly determined by ie, )ibd5lwqqrn,56 r

  09.27: A proton moves straight up the plane of thi6p7p5 z5ae.yu8gk 2bg deys, ws page into a region that has a magnetic field directed to the right. If the particle is undeflectea25pszp udybg.g kwe5 8 7y,6ed 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 plmd*;ku r s8eu8ane 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 I directed into the plane of the page (as shown). There is no electric field in Region II. What is a necessary d 8*m8k;usude rirection of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge zj:o/bqj 1z n :1 i0y/cxpsbx7moves with constant velocity through a region of space containing both ybzcxs1zqx1pojb: nj/:i/0 7 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 ve3-gra(97 vf 0jlx ehnulocity directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents arjugxn3er vlh9- a70f (e 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.