Question

An Op Amp has an offset voltage of 1mV and is ideal in all other respects. If this Op Amp is used in the circuit shown in figure. The output voltage will be

• A. 1 mV
• B. 1 V
• C. 0.1 V
• D. 0 V

Answer 1

The correct option is B 1 V

gain=$\frac{-R_f}{R_i}=-\frac{{10}^6}{{10}^3}={10}^3$. Since $V_{in}=V_{offset}=1mV$ , we have $V_0=V_{is}\times Gain=-1\times {10}^{-3}\times {10}^3=-1V.$ It may be 1V (since the polarity of offset voltage is not known