Question

In the circuit shown above, an input of $1\,V$ is fed into the inverting input of an ideal Op-amp $A$. The output signal $V_{\text{out}}$ will be

• A. $+10V$
• B. $-10V$
• C. $0V$
• D. Infinity

Answer 1

Answer: (B)

$-10V$

Answer 2

Voltage gain, $\frac{V_{O}}{V_{i}}=-\frac{R_{f}}{R_{i}}=-\frac{10}{1}=-10$ or $V_{o}=-10 V_{i}=-10 \times 1=-10$ volt