Consider the Earth and a cloud layer 300 m above the planet to he the plates of a parallelplate capacitor. (a) If the cloud layer has an area of 'l .0 km"2=1.x'|D*o mtg what is the capacitance? {o} If an electric eld strength greater than 3.0m one WC causes the air to break down and conduct charge (lightning), what is the maximum charge the cloud can hold