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Question

The inside of the bottle of a gold-leaf electroscope is occasionally evacuated 


A
to prevent the charge on the terminal from leaking off through ionisation of the air.
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B
to leak off the charge on the terminal through ionisation of the air.
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C
to prevent the charge on the terminal from leaking off through induction.
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D
None of these
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Solution

The correct option is A to prevent the charge on the terminal from leaking off through ionisation of the air.
The inside of the bottle of gold leaf electroscope is evacuated to prevent the charge on the terminal from leaking off through ionization of air. 

Physics

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