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Chapter 32: Q31P (page 969)
In New Hampshire the average horizontal component of Earth鈥檚 magnetic field in 1912 was , and the average inclination or 鈥渄ip鈥� was . What was the corresponding magnitude of Earth鈥檚 magnetic field?
The magnitude of the earth鈥檚 magnetic field is
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At what rate must the potential difference between the plates of a parallel-plate capacitor with a capacitance be changed to produce a displacement current of?
Figure 32-26 shows four steel bars; three are permanent magnets. One of the poles is indicated. Through experiment ends a and d attract each other, ends c and f repel, ends e and h attract, and ends a and h attract. (a) Which ends are the north poles? (b) Which bar is not a magnet?
An electron with kinetic energy travels in a circular path that is perpendicular to a uniform magnetic field, which is in the positive direction of a zaxis. The electron鈥檚 motion is subject only to the force due to the field.
(a) Show that the magnetic dipole moment of the electron due to its orbital motion has magnitudeBand that it is in the direction opposite that of.(b)What is the magnitude of the magnetic dipole moment of a positive ion with kinetic energyrole="math" localid="1662961253198" under the same circumstances? (c) What is the direction of the magnetic dipole moment of a positive ion with kinetic energyunder the same circumstances? (d) An ionized gas consists ofand the same number density of ions. Take the average electron kinetic energy to beand the average ion kinetic energy to be. Calculate the magnetization of the gas when it is in a magnetic field of.
A capacitor with parallel circular plates of the radius is discharging via a current of 12.0 A . Consider a loop of radiusR/3that is centered on the central axis between the plates. (a)How much displacement current is encircled by the loop? The maximum induced magnetic field has a magnitude of 12.0 mT. (b)At what radius inside and (c)outside the capacitor gap is the magnitude of the induced magnetic field 3.00 mT?
In Fig. 32-32, a parallel-plate capacitor has square plates of edge length . A current of charges the capacitor, producing a uniform electric field between the plates, withperpendicular to the plates. (a) What is the displacement currentthrough the region between the plates? (b)What is in this region? (c) What is the displacement current encircled by the square dashed path of edge length ? (d)What is around this square dashed path?
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