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Chapter 31: Q7. (page 901)
Show that the quantity has units of current.
The Displacement Current
or
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A carbon-dioxide laser emits light with a wavelength of into a diameter laser beam. What force does the laser beam exert on a completely absorbing target?
Consider current passing through a resistor of radius , length , and resistance .
a. Determine the electric and magnetic fields at the surface of the resistor. Assume that the electric field is uniform throughout, including at the surface.
b. Determine the strength and direction of the Poynting vector at the surface of the resistor.
c. Show that the flux of the Poynting vector (i.e., the integral of ) over the surface of the resistor is . Then give an interpretation of this result.
A diameter parallel-plate capacitor has a gap. What is the displacement current in the capacitor if the potential difference across the capacitor is increasing at ?
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" .
FIGURE shows a vertically polarized radio wave of frequency traveling into the page. The maximum electric field strength is . What are
a. The maximum magnetic field strength?
b. The magnetic field strength and direction at a point where , down?
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