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(a) Derive the expression for the capaci...

(a) Derive the expression for the capacitance of a parallel plate capacitor having plate area A and plate separation d.
(b) Two charged spherical conductors of radii `R_(1)` and `R_(2)` when connected by a conducting wire acquire charges `q_(1) and q_(2)` respectively. Find the ratio of their surface charge densities in terms of their radii.

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