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Chapter 31: Q. 23 (page 902)
At what distance from a point source of electromagnetic waves is the magnetic field amplitude ?
Distance,
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A radio antenna broadcasts aradio wave with of power. Assume that the radiation is emitted uniformly in all directions.
a. What is the wave鈥檚 intensity 30 km from the antenna?
b. What is the electric field amplitude at this distance?
The intensity of sunlight reaching the earth is . Assuming all the sunlight is absorbed, what is the radiation pressure force on the earth Give your answer (a) in newtons and (b) as a fraction of the sun's gravitational force on the earth.
A capacitor is discharged, starting at . The displacement current through the plates is . What was the capacitor鈥檚 initial voltage ?
The magnetic field inside a 4.0 cm diameter superconducting solenoid varies sinusoidally between andat a frequency of.
a. What is the maximum electric field strength at a point from the solenoid axis?
b. What is the value of localid="1650012451022" at the instant localid="1650084655519" reaches its maximum value?
A cube of water 10 cm on a side is placed in a microwave beam having . The microwaves illuminate one face of the cube, and the water absorbs of the incident energy. How long will it take to raise the water temperature by .Assume that the water has no heat loss during this time.
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