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# . A spark of static electricity, such as that you might

ISBN: 9781938168000 42

## Solution for problem 20CQ Chapter 7

College Physics | 1st Edition

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Problem 20CQ

. A spark of static electricity, such as that you might receive from a doorknob on a cold dry day, may carry a few hundred watts of power. Explain why you are not injured by such a spark.

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Solution 20CQ

Static electricity refers to the build-up of electric charges on the surface of a material as a result of friction. The surface can get rid off this excess charge if the latter gets a conducting pathway to flow out of the surface.

Such a discharge of excess charges results in an electric shock of power of a few hundred watts. But static electricity depends on the number of excess electric charge carriers. Larger is the number of charge carriers, the higher will...

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