Can someone help me with the steps to this problem

3b.1 A pair of parallel plates are connected to a 12-V battery and separated by 20 cm. The area of the plate is 4.0 m2. (a) Find out the capacitance, charge on the plate, the electric field, and the potential difference between plates. [Answer: 1.77 x 10-10 F, 2.124 x 109 C, 60 N/C, 12 V] (b) If The capacitor is still connected with the battery and the separation of two plates is doubled, what happens to the above quantities