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Chapter 31: Q7. (page 901)
Show that the quantity has units of current.
The Displacement Current
or
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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.
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.
A current is charging a -diameter parallel-plate capacitor.
a. What is the magnetic field strength at a point radially from the center of the wire leading to the capacitor?
b. What is the magnetic field strength at a point localid="1650010280999" radially from the center of the capacitor?
The figure shows the electric and magnetic fields in frame A. A rocket in frame B travels parallel to one of the axes of the A coordinate system. Along which axis must the rocket travel, and in which direction, in order for the rocket scientists to measure (a) (b) and (c) ?
3. If you curl the fingers of your right hand as shown, are the electric fluxes in FIGURE Q31.3 positive or negative?
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