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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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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 \(3.0 \times {10^6}{\rm{ }}V/m\).
Sketch the equipotential lines for the two equal positive charges shown in Figure. Indicate the direction of increasing potential.
Sketch the equipotential lines a long distance from the charges shown in Figure \({\rm{19}}{\rm{.28}}\). Indicate the direction of increasing potential.
What is the potential from a proton (the average distance between the proton and electron in a hydrogen atom)?
Consider a battery used to supply energy to a cellular phone. Construct a problem in which you determine the energy that must be supplied by the battery, and then calculate the amount of charge it must be able to move in order to supply this energy. Among the things to be considered are the energy needs and battery voltage. You may need to look ahead to interpret manufacturer's battery ratings in ampere-hours as energy in joules.
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