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Chapter 28: Q 8P (page 829)
Question: An electric field ofand a perpendicular magnetic field of act on a moving electron to produce no net force. What is the electron鈥檚 speed?
The electron鈥檚 speed is .
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Figure shows a rectangular 20-turn coil of wire, of dimensions by . It carries a current of and is hinged along one long side. It is mounted in the x-yplane, at angle to the direction of a uniform magnetic field of magnitude . In unit-vector notation, what is the torque acting on the coil about the hinge line?
A 5.0particle moves through a region containing the uniform magnetic field localid="1664172266088" and the uniform electric field 300j^ V/m. At a certain instant the velocity of the particle is localid="1664172275100" . At that instant and in unit-vector notation, what is the net electromagnetic force (the sum of the electric and magnetic forces) on the particle?
Figure 28-31 gives snapshots for three situations in which a positively charged particle passes through a uniform magnetic field . The velocitiesof the particle differ in orientation in the three snapshots but not in magnitude. Rank the situations according to (a) the period, (b) the frequency, and (c) the pitch of the particle鈥檚 motion, greatest first.
In Fig. 28-55, an electron moves at speed v=100m/salong an xaxis through uniform electric and magnetic fields. The magnetic field is directed into the page and has magnitude5.00T. In unit-vector notation, what is the electric field?
In Fig. 28-30, a charged particle enters a uniform magnetic field with speed , moves through a halfcirclein time , and then leaves the field
. (a) Is the charge positive or negative?
(b) Is the final speed of the particle greater than, less than, or equal to ?
(c) If the initial speed had been , would the time spent in field have been greater than, less than, or equal to ?
(d) Would the path have been ahalf-circle, more than a half-circle, or less than a half-circle?
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