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Explain why a neutral electroscope can NOT be used to identify the type of charge carried...

Explain why a neutral electroscope can NOT be used to identify the type of charge carried by a charged rod.

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A neutral electroscope cannot be used to identify the type of charge carried by a charged rod because if either positive or negative charge is brought near its knob, it will behave in a similar way. If positive charge is brought near it, positive charges are repelled in its known and they reside in its stem which diverge away from each other. If negative charge is brought near it, the negative charges are repelled and again the stems diverge. So, same result in both. Thus, neutral electroscope cannot be used to identify the type of charge.

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