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For very low frequencies, capacitor acts as ________(a) Open circuit(b) Short circuit(c) Amplifier(d) RectifierThis question was addressed to me in a national level competition.This intriguing question comes from Capacitors topic in portion Capacitance and Capacitors of Basic Electrical Engineering

Answer»

Right answer is (a) Open CIRCUIT

To elaborate: Capacitive IMPEDANCE is INVERSELY proportional to frequency. Hence at very low frequencies the impedance is almost INFINITY and hence acts as an open circuit and no current flows through it.



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