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posted by Matt on Sunday, January 27, 2013 at 3:09pm.
How many protons are needed to produce a total charge of 2.5*10^-15 C?
Proton charge is same as electron charge but positive in sign +1.6*10^-19 * n = 2.5 * 10^-15 n = 1.5625 * 10^(-15+19) = 15,625
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