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In the circuit shown, the op-amp has finite input impedance, infinite voltage gain, and zero input offset voltage. The output voltage Vout is

In the circuit shown, the op-amp has finite input impedance, infinite voltage gain, and zero input offset voltage. The output voltage Vout is Correct Answer I<sub>1</sub>R<sub>2</sub>

Given:

Zi = finite

Av = ∞

Vi0 = 0

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The current I1 entering the OP-AMP is not zero (as input impedance is finite)

I1 = IR1 + IR2

Due to virtual short, V1 = 0 and hence IR1 = 0

I1 = IR2 

IR2 = V0/R2

V0 = I1 R2

Option 3 is correct. 

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