Question

If the capacitance of a metal sphere is 1 microfarad what is the radius of the sphere​

Answer 1

Capacitance , C =∈0Ad

where,

A is area of the capacitor

d is distance between plates of capacitor

given C = 1 micro farad

∈0 = 8.85 × 10 -12 F / m

For spherical capacitor

A = 4 π r2

where r is radius of capacitor

d = r

So,

r = C4π∈0

= 8.99× 104 m

Answer 2

Answer in the attachment

hope it helps!