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A uniformly charged thin spherical shell...

A uniformly charged thin spherical shell of radius R carries uniform surface charge denisty of `isgma` per unit area. It is made of two hemispherical shells, held together by presisng them with force F(see figure). F is proportional to

A

`1/epsi_(0) sigma^(2) R^(2)`

B

`1/epsi_(0) sigma^(2) R`

C

`1/epsi_(0) sigma^(2)/R`

D

`1/epsi_(0) sigma^(2)/R^(2)`

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The correct Answer is:
A
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