Chapter 20: Q1CQ (page 730)
Can a wire carry a current and still be neutral - that is, have a total charge of zero? Explain.
No. If there's a regularcutting-edge or no cutting-edge, the cord is usually neutral.
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The \({\bf{200}}\;{\bf{A}}\) current through a spark plug moves \({\bf{0}}{\bf{.300}}\;{\bf{mC}}\) of charge. How long does the spark last?
Find the time after \(t = 0\) when the instantaneous voltage of \(60 - Hz\) \({\rm{AC}}\) first reaches the following values:
(a) \({V_0}/2\)
(b) \({V_0}\)
(c) \(0\)
Some surgery is performed with high-voltage electricity passing from a metal scalpel through the tissue being cut. Considering the nature of electric fields at the surface of conductors, why would you expect most of the current to flow from the sharp edge of the scalpel? Do you think high- or low-frequency AC is used?
In cars, one battery terminal is connected to the metal body. How does this allow a single wire to supply current to electrical devices rather than two wires?
What is the power of a \(1.00 \times {10^2}\;MV\) lightning bolt having a current of \(2.00 \times {10^4}\;A\) ?
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