A spherical capacitor consists of two concentric spherical conductors, held is position by suitable insulating supports as shown is figure. The capacitance C, of this spherical capacitor is
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As shown in figure, 
charge spreads uniformly on inner surface of outer sphere of radius 
The induced charge 
spreads uniformly on the outer surface of inner sphere of radius 
. The outer surface of outer sphere is earthed. Due to electrostatic shielding 
for 
and 
for 
In the space between the two spheres, potential difference between two spheres,
Also 
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