Resistance offered by the L or C current in an ac circuit is called reactance. It is of two types
1. Inductive reactance XL = ωL
2. Capacitive reactance,
Inductive reactance increases with the increase in frequency of ac. An inductor offers no resistance (XL= 0) to dc, thus acts as short circuit for dc.
Capacitive reactance decreases with the increase in frequency of ac. A capacitor offers infinite resistance (XC = ∞) to dc, thus doesn’t allow dc to pass through it & acts as open circuit for dc.