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What does (q(1) + q(2)) = 0 signify ?...

What does `(q_(1) + q_(2)) = 0` signify ?

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`q_(1) + q_(2) = 0, q_(1) = -q_(2).` Such a system of point charges is called an electric dipole. It is a pair of equal and opposite point charges separted by a small distance.
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