The outer sphere of a spherical air capacitor is earthed. For increasing its capacitance
Vacuum is created between two spheres
Dielectric material is filled between the two spheres
The space between two spheres is increased
The earthing of the outer sphere is removed
2)Dielectric material is filled between two spheres because
In spherical Capacitor
Capacitance C,
where k is dielectric constant of material between two spheres.
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