An electroscope is used to detect and measure charges what happens in electroscope when its disc is touched with a charged object

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in an electroscope there is a metallic rod at the top there is a metallic disc or cup and at the end it has thin two metallic sheets when we rub a glass rod with a woollen cloth it get charged positivelyand when we touch the"+"charged rod with metallic disc it get +charged and the metallic sheets repel each other due to similar charges
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What happens if its disc is charged with charged object this I don't understand
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