Physics Help Forum Unit of charge

 Electricity and Magnetism Electricity and Magnetism Physics Help Forum

 Nov 23rd 2008, 11:21 PM #1 Junior Member   Join Date: Nov 2008 Posts: 4 Unit of charge I have a question A coulomb is made up of either 6.25 x 1018 electrons or 6.25 x 1018 protons or charged ions carrying a charge of +1 or -1. The question posed - In a solution of Mg+2 ions how many of these ions must flow to a negative point in the solution in order for a coulomb of charge to have flowed to that point? The answer is 3.125 x 1018 Mg2+ ions. Im not sure how the answer is arrived at? Cheers Petra
 Dec 4th 2008, 06:53 AM #2 Junior Member   Join Date: Dec 2008 Posts: 13 Here Mg+2 ion carries 2 units of +ve charge.Hence 1/2 of total charge is sufficient to produce same current.Similarly if you have +or-3 on an ion 1/3 of total carriers is sufficient.

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