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Q.

The outer sphere of a spherical air capacitor is earthed. For increasing its capacitance

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a

Vacuum is created between two spheres

b

Dielectric material is filled between the two spheres

c

The space between two spheres is increased

d

The earthing of the outer sphere is removed

answer is B.

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Detailed Solution

In spherical capacitor C=4πε0Kabb−a⇒C∝K
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The outer sphere of a spherical air capacitor is earthed. For increasing its capacitance