# Atmospheric Physics

Electricity and Magnetism Level 5

Treating the Earth and cloud as a capacitor, we can estimate the current of lightning. Suppose the base of a stormcloud is 3km above ground, with a surface area roughly $${10}^{8} {m}^{2}$$. If the dielectric constant of air is approximately 1 and the potential difference of the Earth-cloud system is $${10}^{8} V$$, what would the average current (in Amperes) be if the electric energy is discharged in 0.2 seconds?

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