Question

How the presence of charges can be detected​

Answer 1

Answer:

The electroscope is an early scientific instrument used to detect the presence of electric charge on a body. It detects charge by the movement of a test object due to the Coulomb electrostatic force on it. The amount of charge on an object is proportional to its voltage.

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Answer 2

Presence can be detected by conduction of electricity by the particular substance.

ie like electrolysis

btw

Electroscope, instrument for detecting the presence of an electric charge or of ionizing radiation, usually consisting of a pair of thin gold leaves suspended from an electrical conductor that leads to the outside of an insulating container.