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Chapter 20: Problem 14
A typical lightning flash delivers about 25 C of negative charge from cloud to ground. How many electrons are involved?
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In his famous 1909 experiment that demonstrated quantization of electric charge, R. A. Millikan suspended small oil drops in an electric field. With field strength \(20 \mathrm{MN} / \mathrm{C},\) what mass drop can be suspended when the drop carries 10 elementary charges?
Suppose the electron and proton charges differed by one part in one billion. Estimate the net charge on your body, assuming it contains equal numbers of electrons and protons.
A -1.0 - \(\mu\) C charge experiences a \(10 \hat{\imath}\) -N electric force in a certain electric field. What force would a proton experience in the same field?
Equation 20.3 gives the electric field of a point charge. Does the direction of (a) \(\hat{r}\) or (b) \(\vec{E}\) depend on whether the charge is positive or negative?
Two identical small metal spheres initially carry charges \(q_{1}\) and \(q_{2} .\) When they're \(1.0 \mathrm{m}\) apart, they experience a \(2.5-\mathrm{N}\) attractive force. Then they're brought together so charge moves from one to the other until they have the same net charge. They're again placed \(1.0 \mathrm{m}\) apart, and now they repel with a \(2.5-\mathrm{N}\) force. What were the original charges \(q_{1}\) and \(q_{2} ?\)
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