The opposition by the inductor due to the inductive reactance property is proportional to the supply frequency that means if supply frequency increases the opposition also be increased. For this reason, an inductor can totally block the very high-frequency AC.
Does inductor completely block AC?
Inductors do not 'block' AC. An inductor has a higher impedance to AC than it does to DC so it will reduce the AC current but it will not reduce it to zero.
Why capacitor blocks DC and inductor blocks AC?
We know that there is no frequency i.e. 0Hz frequency in DC supply. If we put frequency “f = 0″ in the inductive reactance (which is AC resistance in capacitive circuit) formula. If we put XC as infinity, the value of current would be zero. That is the exact reason why a capacitor block DC.
