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Electric Potential: finding charges (physics)?

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The graph in the figure shows the electric potential energy as a function of separation for two point charges. If one charge is +0.44 nC, what is the other charge?

answer in nC


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The PE formula is;

U = kqQ/r

From graph U = -4x10^-6 J when r=.01 m

-4x10^-6 = (9x10^9)(.44x10^-9)Q/.01

Q = - 10 nC

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