Question

on
Detecting Charges
An electroscope is a device used to detect the presence of charge and the type of
charge in a body. It is based on the principle that like charges repel each other'.
It has a glass jar mounted on a wooden base. A brass disc covers the mouth of the
The gold leaf electroscope was first invented by Abraham Bennett in 18th century.
jar. A brass rod passes through the mouth of the jar and is fixed to a brass disc
of metal foil, generally made of tin, are placed inside the jar at the base and are
at its top. The other end of the rod has two thin pieces of gold leaves. Two pieces
connected to the Earth. If the gold leaves draw large charge, then the metal foils
will ensure that the excess charge flows to the Earth.​

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