Question

Explain why current flows through an ideal capacitor when it is connected to an a.C. Source but not when it is connected to a d.C. Source in a steady state.

Answer 1

see.......we know the reactance of a capacitor is given by  Xc= 1/2πnC

...........where n = frequency

                    C = capacitance

now this expression involves frequency in it....     (Xc is 1/n)

in case of dc source  frequency is 0

therefore,  n = 0

                   Xc = ∞

therefore, in this case the capacitor is offering such a large resistance to the flow of current that is infinite..........the charge is thereby not able to flow in case of dc source.

I HOPE U GET THAT.........