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Consider the figure given below. Known that vo = 4V and vi = 2V, determine the gain for the op amp assuming that it is ideal except for the fact that it has finite gain

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Consider the figure given below. Known that vo = 4V and vi = 2V, determine the gain for the op amp assuming that it is ideal except for the fact that it has finite gain

(a) 1001

(b) 2002

(c) 3003

(d) 4004

The question was posed to me in a job interview.

My query is from The Ideal Operational Amplifiers in portion Operational Amplifiers of Electronic Devices & Circuits

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The correct answer is (b) 2002

Easiest explanation: The Voltage at the positive input has to be -3.000v, vi = -3.020v

A = vo / vi – vr = -2 / -3.020 -(-3) = 100.

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