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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

`alpha^(2)R^(2)`

B

`alpha^(2)R`

C

`alpha^(2)/(R)`

D

`alpha^(2)/(R^(2))`

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