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Chapter 31: Q. 5 (page 901)
A rocket zooms past the earth at . Scientists on the rocket have created the electric and mag-netic fields shown in FIGURE EX31.5. What are the fields measured by an earthbound scientist?
The fields measured by an earthbound scientist are
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Shows the electric field inside a cylinder of radius localid="1649879543758" . The field strength is increasing with time as localid="1649879549377" , where is in . The electric field outside the cylinder is always zero, and the field inside the cylinder was zero for localid="1649879554833" .
localid="1649879566359" Find an expression for the electric flux localid="1649879560575" through the entire cylinder as a function of time.
localid="1649879572467" . Draw a picture showing the magnetic field lines inside and outside the cylinder. Be sure to include arrowheads showing the field鈥檚 direction.
localid="1649879587867" . Find an expression for the magnetic field strength as a function of time at a distance localid="1649879577475" from the center. Evaluate the magnetic field strength atlocalid="1649879582437" , localid="1649879592577" .
d. Find an expression for the magnetic field strength as a function of time at a distancelocalid="1649879597467" from the center. Evaluate the magnetic field strength at localid="1649879602321" , localid="1649879607075" .
The magnetic field of an electromagnetic wave in a vacuum is , where is in and is in s. What are the wave's (a) wavelength, (b) frequency, and (c) electric field amplitude?
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?
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
What is the current through surface in FIGURE Q31.4 if you curl your right fingers in the direction of the arrow?
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