A metal sphere has a charge of +6.2 μC. What is the net charge after 7.7 x 10^13 electrons have?
A metal sphere has a charge of +6.2 μC. What is the net charge after 7.7 x 10^13 electrons have been placed on it?
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You have to know how many charges there are in a Coulomb. Look in the book. It will tell you. Then convert the number of electrons that are added to the sphere into number of coulombs, or in this case microcoulombs and add it to the number of positive charges on the sphere. Note that I said positive charges and you're adding negative charges to the sphere, so what does that mean?