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Charging by Induction
Purpose:To demonstrate charging of objects by induction.
Procedure:Use the Faraday's cage as a reliable electroscope that also measures the charge sign. Rub Teflon stick on silk (should produce a negative charge) or Glass/lucite on Teflon wrap (to produce a positive charge) and transfer it to a pith ball on a stick by touching. Measure the charge with electroscope. Next reset the electroscope and charge the pith ball by induction. Do so by short circuiting the pith ball to the metal handle with your palm and finger. Bring the charged object close and "disconnect" the ground by removing the finger from the ball. Demonstrate on the electroscope that the charge on the ball is now opposite to what it was while charged by touching.
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