How do you determine if a charged comb is positively charged or negatively charged. Suppose it is positively charged, it will attract negative charge on the electroscope and the positive charges on the leaves will repel. If it is negatively charged, it will attract positive charge leaving the negative leaves to repel
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You can't determine the sign of a charged object with an electroscope. You need to see how it interacts with another object whose charge is known.
electroscope is just used to determine the amount of charge.
to determine the charge on it u have to take it near to a body whose charge is known. e.g. u take it 2 a positively charged body, if it repels its positive and if it attracts its negative.