# The outer sphere of a spherical air capacitor is earthed. For increasing its capacitance Option 1) Vacuum is created between two spheres Option 2) Dielectric material is filled between the two spheres Option 3) The space between two spheres is increased Option 4) The earthing of the outer sphere is removed

2)Dielectric material is filled between two spheres because

In spherical Capacitor

Capacitance C,

$C = 4\pi \epsilon _{0}k\left (\frac{ab}{a-b} \right )$

$C\propto k$

where k is dielectric constant of material between two spheres.

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