Regarding the Earth and a cloud layer 800 m above the Earth as the “plates’’ of a capacitor, calculate the capacitance. Assume the cloud layer has an area of 1.00 km2 and that the air between the cloud and the ground is pure and dry. Assume charge builds up on the cloud and on the ground until a uniform electric field of 3.00 x 106 N/C throughout the space between them makes the air break down and conduct electricity as a lightning bolt. What is the maximum charge the cloud can hold?