Question

The loop gain for an ideal operational amplifier with R1 = 10kΩ and R2(negative feedback) = 1MΩ is

(a) 20 db

(b) 40 db

(c) 60 db

(d) 80 db

This question was addressed to me in an interview for internship.

This question is from The Inverting Configuration topic in division Operational Amplifiers of Electronic Devices & Circuits

Answer 1

Correct choice is (b) 40 db

To explain I would say: Loop gain in this case is given by 20 log (1000000/10000).