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Five point charges, each of value +q are...

Five point charges, each of value +q are placed on five vertices of a regular hexagon of side Lm. What is the magnitude of the force on a point charge of value -q coulomb placed at the centre of the hexagon?

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The forces due to the charges placed diagonally opposite at the vertices of hexagon, on the charge –q cancel in pairs. Hence net force is due to one charge only.
Net force, `|vec(F)|=(1)/( 4 pi epsilon_(0))(q^(2))/(l^(2))`
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