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Chapter 26: Q. 20 (page 738)
Light from the sun allows a solar cell to move electrons from the positive to the negative terminal, doing of work per electron. What is the emf of this solar cell?
The emf of the solar cell is
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Charge is uniformly distributed with charge density \rho inside Calc a very long cylinder of radius R. Find the potential difference between the surface and the axis of the cylinder.
What is the potential difference between and in the uniform electric field ?
Engineers discover that the electric potential between two electrodes can be modeled as , where is a constant, is the distance from the first electrode in the direction of the second, and is the distance between the electrodes. What is the electric field strength midway between the electrodes?
Figure Q26.8 shows a negatively charged electroscope. The gold leaf stands away from the rigid metal post. Is the electric potential of the leaf higher than, lower than, or equal to the potential of the post? Explain.
A capacitor being charged has a current carrying charge to and away from the plates. In the next chapter we will define current to be the rate of charge flow. What is the current to a capacitor whose voltage is increasing at the rate of ?
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