Why the capacitor of capacitance 1 farad can be realized?
For parallel plate capacitor, the expression is epsilon A / d. epsilon value will be of the order of 10^–12. So for the value of capacitance to be one farad the area of the plate has to be the order of 10^8 m^2. This is so large area even though the distance of separation of the plates is of the order of 0.1 mm. So 1 farad is not realized. One more reason is that to produce electromagnetic waves of higher frequency we need only smaller values of capacitance. Thus practical need and practical limitations make 1 farad not a requirement!
