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An op amp having a 106-dB gain at dc and a single-pole frequency response with ft = 2 MHz is used to design a non-inverting amplifier with nominal dc gain of 100. The 3-dB frequency of the closed-loop gain is

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An op amp having a 106-dB gain at dc and a single-pole frequency response with ft  = 2 MHz is used to design a non-inverting amplifier with nominal dc gain of 100. The 3-dB frequency of the closed-loop gain is

(a) 10 kHz

(b) 20 kHz

(c) 30 kHz

(d) 40 kHz

I have been asked this question by my school teacher while I was bunking the class.

My question is from Effect of Finite Open-Loop gain and Bandwidth on Circuit Performance topic in division Operational Amplifiers of Electronic Devices & Circuits

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The correct answer is (b) 20 kHz

Explanation: Use the equation below to obtain a frequency response curve and proceed further.

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