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Chapter 19: Q13CQ (page 694)
Can different equipotential lines cross? Explain.
No, the different equipotential lines cannot cross each other.
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Sketch the equipotential lines for the two equal positive charges shown in Figure. Indicate the direction of increasing potential.
Voltage is the common word for potential difference. Which term is more descriptive, voltage or potential difference?
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.
(a) Will the electric field strength between two parallel conducting plates exceed the breakdown strength for air\(\left( {3.0 \times {{10}^6}\;V/m} \right)\)/ if the plates are separated by\(2.00\;mm\)and a potential difference of\(5.0 \times {10^3}\;V\)is applied?
(b) How close together can the plates be with this applied voltage?
Find the maximum potential difference between two parallel conducting plates separated by \(0.500{\rm{ }}cm\) of air, given the maximum sustainable electric field strength in air to be \(3.0 \times {10^6}{\rm{ }}V/m\).
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