What is the use of the rubber stopper in a gold-leaf electroscope??

A rubber stopper is used in an electroscope as it is a poor conductor of electricity and charge. A non- conducting material does not disperse the charge.

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 This Gold Leaf Electroscope In Glass Flask is practical and economical electroscope consists of leaf mounted on metal rod hold by rubber stopper in a conical flask. The shape of flask is such that it gives ample space for the leaf to diverge when charged. 

Gold Leaf Electroscope In Glass Flask

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