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Chapter 31: Q. 3 (page 900)
3. If you curl the fingers of your right hand as shown, are the electric fluxes in FIGURE Q31.3 positive or negative?
Part (a) The flux is negative.
Part (b) The flux is positive.
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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鈥檚 frame sees a currentpassing through the center of the loop.
d. What electric and magnetic fields would an experimenter in the loop鈥檚 frame calculate at distance r from the current of part c?
e. Show that your fields of parts b and d are the same.
Avertically polarized laser beam passes through a polarizing filter whose axis is from horizontal. What is the power of the laser beam as it emerges from the filter?
Is the electric field strength in FIGUREincreasing, decreasing, or not changing? Explain.
You've recently read about a chemical laser that generates a -diameter, laser beam. One day, after physics class, you start to wonder if you could use the radiation pressure from this laser beam to launch small payloads into orbit. To see if this might be feasible, you do a quick calculation of the acceleration of a -diameter, , perfectly absorbing block. What speed would such a block have if pushed horizontally along a frictionless track by such a laser
When the Voyager spacecraft passed Neptune in , it was from the earth. Its radio transmitter, with which it sent back data and images, broadcast with a mere of power. Assuming that the transmitter broadcast equally in all directions,
a. What signal intensity was received on the earth
b. What electric field amplitude was detected
The received signal was somewhat stronger than your result because the spacecraft used a directional antenna, but not by much.
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