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Two spherical conductors A and B of radi...

Two spherical conductors A and B of radii a and b (`b gt a`) are placed concentrically in air. A is given charged +Q while B is earthed. Then the equivalent capacitance of the system is

A

`4piepsilon_(0)(ab)/(b-a)`

B

`4piepsilon_(0)(b+a)`

C

`4piepsilon_(0)b`

D

`4piepsilon_(0)a`

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