Electric Fields
a) Estimate the voltage of a thundercloud from which lightning strikes the
ground 200m below. (Assume the ground is at 0v).
b) An electric field intensity of 4 x 106 V/m is
required to get a spark to form in air. If the
voltage applied across a spark plug is 5000V,
What will be the spark gap between the
electrodes.
(Please give your answer in mm).
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