Question

To find the nature of charge on an object, will you use a charged electroscope or an uncharged one?

Answer 1

I will use a charged electroscope so that I can observe the change in the divergence of the strips of the electroscope. If the nature of the unknown charge would be similar to the known charge of the electroscope, the divergence of the strips would increase and if the nature of the charge would be opposite to the known charge on the strips of electroscope then the divergence would decrease. That's how we can find the nature of an unknown charge.