a) i) Define the term 'capacitance' of a capacitor. (1 mark) ii) State the unit of capacitance. (1 mark) b) Three capacitors of capacitances 4 µF, 6 µF and 12 µF are connected as follows: the 6 µF and 12 µF capacitors are connected in parallel, and this combination is then connected in series with the 4 µF capacitor. The arrangement is connected to a 24 V d.c. supply. i) Calculate the combined capacitance of the 6 µF and 12 µF capacitors in parallel. (2 marks) ii) Calculate the total capacitance of the entire circuit. (3 marks) iii) Calculate the total charge stored in the circuit. (2 marks) iv) Calculate the voltage across the 4 µF capacitor. (2 marks) v) Calculate the energy stored in the 4 µF capacitor. (3 marks) c) State ONE factor that affects the capacitance of a parallel plate capacitor and explain how it affects the capacitance. (2 marks)