Question

The plates of a parallel plate air capacitor are separated by a distance of 1 mm. What must be the plate area if the capacitance of the capacitor is to be 1F?

Answer 1

 The capacitance of a parallel plate air capacitor is given by;

Note the enormous magnitude of plate area required to have a capacitance of 1F. This shows that farad is a very large unit of capacitance.