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Two identical metals balls with charges ...

Two identical metals balls with charges `+2Q` and `-Q` are separated by some distance and exert a force `F` on each other . They are joined by a conducting wire , which is then removed. The force between them will now be

A

`F`

B

`F//2`

C

`F//4`

D

`F//8`

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The correct Answer is:
D
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