Chapter 31: Q. 7 (page 900)
In what directions are the electromagnetic waves traveling in FIGURE
Short Answer
(a) Electromagnetic wave points travelling out of the page
(b) Electromagnetic wave points travelling upwards
Chapter 31: Q. 7 (page 900)
In what directions are the electromagnetic waves traveling in FIGURE
(a) Electromagnetic wave points travelling out of the page
(b) Electromagnetic wave points travelling upwards
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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.
In reading the instruction manual that came with your garagedoor opener, you see that the transmitter unit in your car produces asignal and that the receiver unit is supposed to respond to a radio wave at this frequency if the electric field amplitude exceeds. You wonder if this is really true. To find out, you put fresh batteries in the transmitter and start walking away from your garage while opening and closing the door. Your garage door finally fails to respond when you're away. What is the electric field amplitude at the receiver when it first fails
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.
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