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July 28, 2015

Homework Help: Physics

Posted by Amy on Thursday, January 24, 2013 at 7:43pm.

Identical point charges of +2.1 C are fixed to diagonally opposite corners of a square. A third charge is then fixed at the center of the square, such that it causes the potentials at the empty corners to change signs without changing magnitudes. Find the sign and magnitude of the third charge.

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