Question

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

• 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 1

Answer: (B)

Dielectric material is filled between the two spheres

Answer 2

In spherical capacitor

$C = 4\pi\varepsilon_{0}K\left( \frac{ab}{b - a} \right)$ ⇒ $C \propto K$