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A uniformly charged thin spherical shell...

A uniformly charged thin spherical shell of radius R carries uniform surface charge density of `sigma` per unit area. It is made of two hemispherical shells, held together by pressing them with force F. F is proportional to

A

`(1)/( in_0) sigma^2 R^2`

B

`(1)/(in_0) sigma^2 R`

C

`(1)/(in_0) ( sigma^2) /( R )`

D

`(1)/( in_0) ( sigma^2)/(R^2)`

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The correct Answer is:
A
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