If you brought a charged plastic strip close to a pith ball that is attatched to

Question

If you brought a charged plastic strip close to a pith ball that is attatched to a string holding the ball between two fingers, then released the ball before removing the plastic strip, would the ball be charged or uncharged? Explain your answer, the sign of the charge relative to that of the plastic, and whether any charge has been lost by the plastic strip during this process, referring to the type of charging if it is charged.

If you had a second identical pith ball and were allowed to move the plastic strip, what sequence of tests would allow you to prove that your answer to part (a) was correct?

Explanation / Answer

When we bought the charged plastic strip close to ball the ball become polarized. On removing the finger the ball will touch the strip and elctron will transfer from strip to the pith balls making it negatively charged (opposite to that of strip). Hence the strip will lose some of the charge.

If we had a second ball then we can bring the strip close to this ball but do not touch it. This will polarize the ball and when we bring this polarized ball near our previous charged ball they will repel each other hence proving that first ball was already charged.

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