Question

In low frequency region, the gain_________

(a) increases

(b) decreases

(c) remains same

(d) depends on value of capacitors

I got this question in my homework.

This intriguing question originated from Problems on AC and DC Analysis topic in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

Answer 1

The correct choice is (b) decreases

To elaborate: At very low frequency, the gain decreases due to the coupling capacitor. When the frequency is decreased, the reactance of the circuit increases and the drop across the coupling capacitor increases. The gain is therefore decreased as the output decreased.