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Chapter 31: Q. 54 (page 903)
For a science project, you would like to horizontally suspend an by inch sheet of black paper in a vertical beam of light whose dimensions exactly match the paper. If the mass of the sheet is , what light intensity will you need
Needed light intensity is.
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a. What is the magnetic field amplitude of an electromagnetic wave whose electric field amplitude is
b. What is the intensity of the wave
In FIGURE P31.33, a circular loop of radius travels with speed along a charged wire having linear charge density . The wire is at rest in the laboratory frame, and it passes through the center of the loop.
a. What are and at a point on the loop as measured by a scientist in the laboratory? Include both strength and direction.
b. What are the fields and at a point on the loop as measured by a scientist in the frame of the loop?
c. Show that an experimenter in the loop’s frame sees a currentpassing through the center of the loop.
d. What electric and magnetic fields would an experimenter in the loop’s frame calculate at distance r from the current of part c?
e. Show that your fields of parts b and d are the same.
A simple series circuit consists of a resistor, a battery, a switch, and a parallel-plate capacitor (initially uncharged) with plates apart. The switch is closed at s.
a. After the switch is closed, find the maximum electric flux and the maximum displacement current through the capacitor.
b. Find the electric flux and the displacement current at
A wire with conductivity s 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
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?
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