Two spherical conductors A and B of radius a and b (b > a) are placed in air concentrically. B is given charge +Q coulomb and A is grounded. The equivalent capacitance of these will be-
(a + b)
b
Text Solution
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The charge Q given to outer sphere distributes as 
outside and 
inside which induces charge 
on outside of inner sphere, 
on inside of inner sphere which is earthed.
The inside of outer and the inner sphere constituting a spherical condenser having capacitance 
and the outside of the outer constitutes an isolated sphere of capacitance 
.
the effective capacitance is
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