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Find the input voltage of an ideal op-amp. It’s one of the inputs and output voltages are 2v and 12v. (Gain=3)

(a) 8v

(b) 4v

(c) -4v

(d) -2v

I got this question in examination.

My question comes from Ideal Operational Amplifier topic in portion Operational Amplifier Characteristics of Linear Integrated Circuits

1 Answer

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by (39.8k points)
The accurate choice is (d) -2v

Expand on the concept with: The output voltage, VO = (Vin1– Vin2)

=> 12v=3×(2- Vin2)

=> Vin2= -2v.

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