What is an electroscope?

What will you observe when the metal top of an electroscope is touched with : a negatively charged object ?

What will you observe when the metal top of an electroscope is touched with : a positively charged object ?

How do you identify nature of charge on a charged body using an electroscope?

An electroscope has been charged by induction with the help of charged glassrod. The charge on the electroscope is

A variable parallel plate capacitor and an electroscope are connected in parallel to a battery. The reading of the electroscope would be decreased by.