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Feb24-10, 09:06 PM
P: 2
Quote Quote by mgb_phys View Post
Your finger is earthed.
The penny simply rises to the electric field of the screen - you + the Earth resists changing potential, so a potential difference exists which the screen can sense


But my finger is not technically earthed, of course so is it then that my body is just a much larger conductor than the penny relative to the charge on the screen so I can hold a much larger amount of charge without changing my potential?