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posted by Amanda Tuesday, September 4, 2012 at 11:18am.
How much work does the electric field do in moving a 2 μC charge from a point with a potential of +20 V to a point with a potential of −20 V?
W=q(φ1-φ2) = 2•10^-6•(20-(-20))=8•10^-5 J.
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