A metal sphere is insulated electrically and is given a charge. If 50 electrons are added to the sphere in giving a charge, how many Coulombs are added to the sphere?

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1 answer

This question essentially comes down to how many Coulombs of charge 50 electrons have (i.e., the sphere, the initial charge, etc., are irrelevant). So, knowing that one elementary charge is

e = 1.6×10^-19 C

and that 50 electrons will have a total charge of -50e,

-50e × (1.6×10^-19 C/e) = -8.0×10^-18 C

My parents use to go to Columbia College and would always bring me, and I always wrote down what their teacher put on the board... I hope this helps. :)