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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 laser beam shines straight up onto a flat, black foil of mass .
a. Find an expression for the laser power needed to levitate the foil.
b. Evaluate for a foil with a mass of .
A helium-neon laser emits a -mm-diameter laser beam with a power of . What are the amplitudes of the electric and magnetic fields of the light wave?
What is the electric field amplitude of an electromagnetic wave whose magnetic field amplitude is
3. If you curl the fingers of your right hand as shown, are the electric fluxes in FIGURE Q31.3 positive or negative?
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.
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