Friday, 11 May 2018

Capacitance between Earth and Moon


Is there a capacitance between the Earth and the Moon, and if there was enough potential difference, could a discharge strike occur?



Answer



The capacitance between two plates varies as:


C=eAd


in which $d$ is the distance between the plates, $A$ is the area of the plates and $e$ is the Coulomb constant. e=8.9×1012

Distance from earth to moon: d=4×108 meter
Approximate equivalent earth surface: A=(1.28×104)2
Therefore, C=8.9×1012×1.64×1084×108=2.39×1011=10 pF


The numbers were truncated to the nearest the third place.



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