A charge \( Q \) is placed at each of the two opposite corners of a square. A charge \( q \) is ...

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A charge \( Q \) is placed at each of the two opposite corners of a square. A charge \( q \) is placed at each of the other two corners. If the resultant force on each charge \( q \) is zero, then
(a) \( q=\sqrt{2} Q \)
(b) \( q=-\sqrt{2} Q \)
(c) \( q=2 \sqrt{2} Q \)
(d) \( q=-2 \sqrt{2} Q \)
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