Why Static Charges are Affected on Dry Days

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Homework Statement


why should experiemnts related to static charges be carried out on dry days?


Homework Equations


I know this somehow relates to the moisture in air. yet, I do not understand the concept behind.


The Attempt at a Solution


Do the sparks created by the wan der graff generator or lightlings seen in thunderstorms relate to this concept. if so, how?
 
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