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A charge Q is located at x = 0 and a charge 4Q is at x...

A charge Q is located at x = 0 and a charge 4Q is at x = 12.0 cm. The force on a charge of -7 µC is zero if that charge is placed at x = 4.0 cm and is 800 N in the positive x direction if placed at x = 8.0 cm. Determine the charge Q.
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