Question 4 ( \( \mathrm{CO} 2 \rightarrow \mathrm{PO}) \) : Consider a parallel-plate capacitor where the separation between the plates can be varied. The maximum capacitance it can withstand is 120pF. You charge the capacitor to a potential difference of 50mV at maximum capacitance and then isolate it. With the capacitor still isolated, evaluate what plate separation is required so that it now has a potential difference of 30 V ? The plate area is 3.1 cm 2,(C4)