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Five identical charges Q are placed equi...

Five identical charges Q are placed equidistant on a semicircle as shown in the figure. Another point charge q is kept at the center of the circle of radius R. Calculate the electrostatic force experienced by the charge q.

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`vec( F) = (1)/(4pi epsilon_(o)) (qQ)/( R^2)( 1+ sqrt(2) ) N hat(i)`
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