Posted by Michael on Monday, January 25, 2010 at 12:51am.
Use the Coulomb formula and solve for Q.
0.300 N = k Q^2/R^2
What are the units of the 75.0? cm? meters? When you use the formula, R (the separation distance) should be in meters. You may need to look up the constant k, if you don't know it already.
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