find the net force on the centre charge Q at the centre
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Explanation:
4Q^2/l^2 ( where l is length of the each side of hexagon)only -Qand corner of -Q charge,+Q force exist other 4 eliminate each other
these is regular hexagon so all length are equal distance of -Q and middle +Qis (l/√2) ,also middle +Qand corner +Q charge same distance