Physics - Semiconductors Question with Solution | TestHub

From the given logic circuit, the inputs to the NOR gate are $B$ and $C$. Its output is $\overline{B+C}$.

This output is fed to an AND gate along with input $A$.

The final output $Y$ is given by the Boolean expression:
$Y=A\cdot (\overline{B+C})$

For the output $Y$ to be HIGH ($Y=1$), both inputs to the AND gate must be HIGH ($1$).
Therefore, $A=1$ and $\overline{B+C}=1$.

For $\overline{B+C}=1$, we must have $B+C=0$, which implies $B=0$ and $C=0$.

Thus, the output $Y$ is HIGH when $A=1$, $B=0$, and $C=0$.

Answer: when $\mathrm{A}=1,\mathrm{B}=0,\mathrm{C}=0$