GATE EC 2021 Set 1 Q10 — Op-amp Circuits

Consider the circuit with an ideal $\text{OPAMP}$ shown in the figure.

Assuming $\left | V_{\text{IN}} \right |\ll \left | V_{\text{CC}} \right |$ and $\left | V_{\text{REF}} \right |\ll \left | V_{\text{CC}} \right |$, the condition at which $V_{\text{OUT}}$ equals to zero is