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Chapter 31: Q. 8 (page 901)
Show that the displacement current inside a parallel-plate capacitor can be written .
Displacement current inside a parallel plate capacitor can be written as:
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A wire with conductivity carries current . The current is increasing at the rate .
(a) Show that there is a displacement current in the wire equal to .
(b) Evaluate the displacement current for a copper wire in which the current is increasing at role="math" localid="1649863246618" .
A radio receiver can detect signals with electric field amplitudes as small as . What is the intensity of the smallest detectable signal
An astronaut has gone outside his space capsule to do some repair work. Unfortunately, he forgot to lock his safety tether in place, and he has drifted away from the capsule. Fortunately, he has a portable laser with fresh batteries that will operate it for . His only chance is to accelerate himself toward the space capsule by firing the laser in the opposite direction. He has a role="math" localid="1649937737036" supply of oxygen. How long will it take him to reach safety?
What are the electric field strength and direction at the position of the electron in FIGURE
At one instant, the electric and magnetic fields at one point of an electromagnetic wave are and .
a. What are the values of and ?
b. What is the Poynting vector at this time and position?
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