An RC coupled amplifier has an open loop gain of 200 and a lower cutoff frequency of 50 Hz. If negative feedback with β = 0.1 is used, the lower cut off frequency will be

• about 50 Hz
• about 5 Hz
• about 2.38 Hz
• about 70.5 Hz

Correct Answer: about 2.38 Hz

Explanation:

New lower cutoff frequency = .