Chapter 19: Q7CQ (page 694)
What is the strength of the electric field in a region where the electric potential is constant?
The electric field’s strength will be zero in a region with constant electric potential.
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Sparks will occur between the plates of an air-filled capacitor at lower voltage when the air is humid than when dry. Explain why, considering the polar character of water molecules.
A \({\bf{0}}.{\bf{500}}{\rm{ }}{\bf{cm}}\) diameter plastic sphere, used in a static electricity demonstration, has a uniformly distributed \({\bf{40}}.{\bf{0}}{\rm{ }}{\bf{pC}}\)charge on its surface. What is the potential near its surface?
How are units of volts and electron volts related? How do they differ?
What is the potential from a proton (the average distance between the proton and electron in a hydrogen atom)?
A nervous physicist worries that the two metal shelves of his wood frame bookcase might obtain a high voltage if charged by static electricity, perhaps produced by friction.
(a) What is the capacitance of the empty shelves if they have area \(1.00 \times {10^2}\;{m^2}\) and are \(0.200\;m\) apart?
(b) What is the voltage between them if opposite charges of magnitude \(2.00nc\) are placed on them?
(c) To show that this voltage poses a small hazard, calculate the energy stored.
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