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2. Three point charges are placed at the corners of a square of side a. Two of the charges are +q and the third charge is Q with an unknown magnitude and sign. The arrangement of the charges is shown in the diagram below. It is now observed that a positive test charge +4o placed at the empty corner experi ences zero electrostatic force. Determine the magnitude and sign of the unknown charge Q. Hint your answer will be in terms of q. So for example you could say that Q +2.54 unknown charge +q
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