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The main component responsible for the fall of gain of an RC coupled amplifier in low frequency range is 

(A) The active device itself (tube, or transistor) 

(B) stray shunt capacitance Cs 

(C) the grid leak resistance Rg 

(D) coupling capacitor Cc

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The main component responsible for the fall of gain of an RC coupled amplifier in low frequency range is coupling capacitor Cc

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