Question

For an ideal operational amplifier (except for the fact that it has finite gain) one set of the value for the input voltages (v2 is the positive terminal v1 is the negative terminal) and output voltage (v0) as determined experimentally is v1= 2.01V, v2=2.00V and v0= -0.99V. Experiment was carried with different values of input and output voltages. Which of the following is not possible considering experimental error?

(a) v1= 1.99V, v2= 2.00V, v0 = 1.00V

(b) v1= 1.00V, v2= 1.00V, v0 = 0V

(c) v1= 1.00V, v2= 1.10V, v0 = 10.1V

(d) v1= 0.99V, v2= 2.00V, v0 = 1.00V

This question was addressed to me during an online exam.

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

Answer 1

Right answer is (d) v1= 0.99V, v2= 2.00V, v0 = 1.00V

To explain I would say: Only option d does not satisfies the mathematical relation between the given quantities.