A device used for detecting and testing the nature of charge on a body is ______?

A device used for detecting and testing the nature of charge on a body is ______?

جسم پر چارج کی نوعیت کا پتہ لگانے اور جانچنے کے لئے استعمال ہونے والا ایک آلہ ______ ہے؟
Explanation

An electroscope detects the presence and type of electric charge on a body.

It shows whether the charge is positive or negative by the movement of its leaves.