Why capacitor pass A.C and Block D.C ?

Answer Posted / sirish

Also the Capacitive Reactance Xc = 1/(2*pi*f*C)

and as a DC voltage has no frequency associated with it

f = 0

thereby Xc = infinity, and thus is an open to DC.

In a similar fashion for high frequency circuits like RF,
Caps act as a short as Xc tends towards 0.

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