Question

______ is a device used to detect the nature of charge on a body.

Answer 1

1. The electroscope is a device that contains two gold leaves that help to detect the presence or nature of a charge brought close to it.
2. Whenever a charged body is brought near to the electroscope, the divergence between the leaves increases or decreases based on the nature of the charge on them.

Hence, an electroscope is a device used to detect the nature of charge on a body.