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For extremely low frequencies, RC coupling is not used because of ___________

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For extremely low frequencies, RC coupling is not used because of ___________

(a) There is considerable power loss

(b) There is a hum in the output

(c) Electrical size of the coupling capacitor

(d) Low efficiency

The question was posed to me in unit test.

I'm obligated to ask this question of Multistage Amplifier in portion Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Right choice is (c) Electrical size of the coupling capacitor

The explanation: Xc = the electrical size of coupling capacitor

Relation of Xc with the signal frequency (f):

Xc = 1 \Xc   is inversely proportional to f.

At low frequencies, Xc becomes very large; output reactance of capacitor increases.

The voltage across load resistance also reduces because some voltage drop takes place across Xc.

Thus output voltage reduces. Therefore gain is very low.

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