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    Calculating Electric Charges

    Homework Statement The question lies in the equation, I do not understand where the SQRT of 3Q or the 2L^2 is coming from? Can somebody help me with this? The professor kinda breezed by this but I cannot find a valid explanation anywhere! Thanks in advance!
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    Find the Magnitude

    Homework Statement A nickel coin has a mass of about 4.3g. Each mole (6.02e23 atoms) has a mass of about 58.2g Homework Equations I found the number of electrons on each coin, which is 1.245e24 and also the number of atoms on the coin which is 4.447e22. The Attempt at a Solution Now...