The adjoining figure shows a negatively charged electroscope. If a negatively charged rod is brought close to, but not touching, the knob, the two leaves will :

move closer together

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move farther apart

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not move at all

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None of these

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Solution

The correct option is A move farther apart
Answer is B.
In this case, the given electroscope is negatively charged. If a negatively charged rod is brought close to, but not touching, the knob, the two leaves will move far apart as the like charges repel each other.

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