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A charge $\mathit{q}\;$ is placed at the center of line joining two equal charges Q. The system of 3 charges will be in equilibrium if $\mathit{q}\;$ is equal to:

\[(a)\;\frac{-Q}{2} \qquad (b)\;\frac{-Q}{4}\qquad (c)\;\frac{Q}{4}\qquad (d)\;\frac{Q}{2}\]

1 Answer

$(b)\;\large\frac{-Q}{4}$
answered Nov 7, 2013 by pady_1
 

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