Day 99: How Much Excess Charge is on Scotch Tape?

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When Scotch tape is stuck to the table and quickly pulled off, it becomes charged. In AP Physics today, students were challenged to determine the amount of excess charge on a piece of tape. Pictured is one possible set-up. Yes, many assumptions must be made, yet all groups got between 10 nC and 50 nC. What is even more surprising is that this means that only about 0.0001% of the atoms on the surface of the tape gain an electron!

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About Frank Noschese

HS Physics Teacher constantly questioning my teaching.

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