(a(i))[2]
State what feedback means.
(a(ii))[2]
State two advantages of negative feedback in an amplifier circuit.
(b)
A circuit that includes an ideal operational amplifier (op-amp) is used to amplify a microphone output. Fig. 7.1 shows the circuit.
(b(i)1)[2]
If the potential at point $P$ is $48\,\text{mV}$, then the output potential difference $V_{\text{OUT}}$ is $3.6\,\text{V}$. Determine the gain of the amplifier circuit.
(b(i)2)[2]
Determine the resistance value of resistor $R$.
(b(ii))[2]
State and explain what happens to the amplifier output when the potential at $P$ exceeds $68\,\text{mV}$.