An electroscope is a simple device consisting of a metal ball that is attached b

Question

An electroscope is a simple device consisting of a metal ball that is attached by a conductor to two thin leaves of metal foil protected from air disturbance in a jar. When the ball is touched by a charged body, why do the leaves that normally hang straight down spread apart?

1. None of these

2. The charge transfers to the leaves through the metal ball. Since the leaves have the same charge, they are pushed away from each other.

3. The charge transfers to the leaves through the glass. Since the leaves have different charges, they are pushed away from each other.

4. The charge transfers to the leaves through the metal ball. Since the leaves have different charges, they are pushed away from each other.

5. The charge transfers to the two leaves through the glass. Since the leaves have the same charges, they are pushed away from each other

Explanation / Answer

When a ball is touched by a charged body, the leaves normally hang straight down spread out because the two leaves will have the like charges and we know like charges can repel each other, so the leaves can spread out.

So option 2 is the our right choice.

Because metal ball transfer the charge to the leave from the metal ball and we already discussed leave have the same charge and they are pushed away from each other because similar charges repels each other.

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