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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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Large quantities of dust should have been left behind after the creation of the solar system. Larger dust particles, comparable in size to soot and sand grains, are common. They create shooting stars when they collide with the earth's atmosphere. But very small dust particles are conspicuously absent. Astronomers believe that the very small dust particles have been blown out of the solar system by the sun. By comparing the forces on dust particles, determine the diameter of the smallest dust particles that can remain in the solar system over long periods of time. Assume that the dust particles are spherical, black, and have a density of . The sun emits electromagnetic radiation with power .
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 radar system at an airport broadcasts microwaves with of power. An approaching airplane with a cross section is away. Assume that the radar broadcasts uniformly in all directions and that the airplane scatters microwaves uniformly in all directions. What is the electric field strength of the microwave signal received back at the airport later?
Unpolarized light with intensity passes first through a polarizing filter with its axis vertical, then through a second polarizing filter. It emerges from the second filter with intensity . What is the angle from vertical of the axis of the second polarizing filter?
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 ?
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