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Three charges –q, Q and –q are placed at equal distances on a straight line. If the potential energy of the system of three charges is zero, then find the ratio of Q : q.

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$q=4Q$
or $\large\frac{Q}{q}=\frac{1}{4}$
Hence B is the correct answer.
answered Jun 11, 2014 by meena.p
 

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