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Identical +3.99 µC charges are fixed to adjacent corners of a square. What charge (magnitude and...

Identical +3.99 µC charges are fixed to adjacent corners of a square. What charge (magnitude and algebraic sign) should be fixed to one of the empty corners, so that the total electric potential at the remaining empty corner is 0 V?
__________c

An equipotential surface that surrounds a point charge q has a potential of 455 V and an area of 0.91 m2. Determine q.

________c

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