Why is it difficult to construct a conductor of capacitance 1F ?

Explanation

If the conductor is assumed to be spherical, then its capacitance is `C = 4pi in_0r`
`:. " "r = (C )/(4pi in_0) = (1)/((1)/(9xx10^(9)) = 9 xx10^(9)m`
So the radius of the spherical conductor of capacitance 1 F is very large and even greater than the radius of the earth `(6.4 xx10^(6) m)`. Hence it is difficult to sonstruct a conductor of capacitance 1 F.