(a(i))[1]
Show that the potential at the inverting input of the op-amp is $+1.0\,\text{V}$.
(a(ii))[4]
Explain why the potential difference across resistor $R$ is $+5\,\text{V}$ when $V_{\text{IN}}$ is greater than $1.0\,\text{V}$ and becomes zero when $V_{\text{IN}}$ is less than $1.0\,\text{V}$. $V_{\text{IN}} > 1.0\,\text{V}$: $V_{\text{IN}} < 1.0\,\text{V}$:
(b(i))[2]
On the axes in Fig. 10.2, plot how the output potential $V_{\text{OUT}}$ varies with time $t$.
(b(ii))[1]
Suggest a use for this type of circuit.