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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 `sigma` per unit area. It is made of two hemispherical shells, held together by presisng them with force F(see figure). F is proportional to

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The correct Answer is:
A
`F = Eq = (sigma)/(2 in_(0)) xx (2pi R^(2) sigma) = (pi sigma^(2) R^(2))/(in_(0))`
`:. F prop (sigma^(2) R^(2))/(in_(0))`
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