a) An empty 5-pF capacitor is charged to a potential difference of 12 V. The charging battery ist hen disconnected, and a piece of Mica with a dielectric constant of

6 is inserted to completely fill the space between the capacitor plates. What are the values of the capacitance, the charge of the plate, the potential difference between the plates and the energy stored in the capacitor with and without dielectric?(2 Marks) b) Explain how you could increase the resistance of a wire by changing the cross-sectional area,the length and the resistivity of the wire.(1 Mark)