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Identical point charges of +1.2 µC are fixed to three of the four corners of a...

Identical point charges of +1.2 µC are fixed to three of the four corners of a square. What is the magnitude |q| of the negative point charge that must be fixed to the fourth corner, so that the charge at the diagonally opposite corner experiences a net force of zero?

|q| = Number _______ Units _____

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