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Three equal charges, 2.0xx 10^(-6) C eac...

Three equal charges, `2.0xx 10^(-6)` C each, are held fixed at the three corners of a square of side 5 cm. find the Coulomb force experienced by one of the charges due to the rest two.

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`F=F_(BA)costheta+F_(CA)costheta`
But `F_(BA) =F_(CA)`
` F=2F_(BA)cos theta,theta=30^@`
` =(2xx9xx10^9(2xx10^-6)xx(sqrt(3)/2))/(0.05)^2`
`=24.9N`.
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