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In Millikan’s oil drop experiment , a dr...

In Millikan’s oil drop experiment , a drop of charge `Q` and radius `r` is kept constant between two plates of potential difference of 800V. Then charge on other drop of radius `2r` which is kept constant with a potential difference of 3200 is

A

`Q//2`

B

`2Q`

C

`4Q`

D

`Q//4`.

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