(a(i))[1]
State the meaning of infinite bandwidth.
(a(ii))[1]
State the effect, if any, of increasing the load resistance on the output voltage.
(b(i))[3]
Explain why point P is referred to as a virtual earth.
(b(ii))[2]
Calculate the potential at Q.
(b(iii))[2]
At a temperature of $13^{\circ}\text{C}$, the thermistor T has a resistance of $230\,\text{k}\Omega$. Show that the voltmeter measures a potential difference of $0.88\,\text{V}$.
(c)[2]
In (b), the resistance of thermistor T decreases as its temperature rises. Explain how this temperature change affects the potential difference measured with the voltmeter.