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Home  >>  AIMS  >>  Class12  >>  Physics  >>  Electric Charges and Fields
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Four charges equal to $– Q$ are placed at the four corners of a square and a charge $q$ is at its centre. If the system is in equilibrium the value of $q$ is

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$(B)\;\frac{Q}{4}(1+ 2 \sqrt 2)$
Hence B is the correct answer.
answered Jun 6, 2014 by meena.p
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