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The work done by an external force to move a -6.40 μC charge from point A...

The work done by an external force to move a -6.40 μC charge from point A to point B is 1.40×10−3 J .

If the charge was started from rest and had 4.78×10−4 J of kinetic energy when it reached point B, what must be the potential difference between A and B?

Express your answer with the appropriate units.

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