What is a Gold Leaf Electroscope?
Gold leaf electroscope is an instrument used to test the presence of charge on a body. It works on the principle that like charges repel each other.
The gold leaf electroscope has a very very thin piece of gold foil (called gold leaf) fixed at the top to a piece of copper.
The copper has a large round top, called the cap. The whole thing is put inside a glass case, to stop air blowing the delicate gold leaf around.
The piece of copper goes through insulation in the top of the glass case, so that any charge on the gold leaf cannot escape.
Charge can be transferred to the electroscope by wiping the charged object across the cap. The charge flows over the conducting copper and gold, and the gold leaf rises up because it is repelled by the same charged copper rod.
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