Three charges of magnitude 100`muC ` Ceach are placed at the three corners A, B and Cofan equilateral triangle measuring 4 m on each side. If the .charges at A and Care positive and the charge at B is negative, what is the direction and magnitude of total force on the charge at c.

Explanation

Consider the three charges placed at the three corners of an equilateral triangle AB as shown in the figure.
` F_(" res " ) = F_0 `
From the figure, we have
` " " = (9 xx 10^(9) xx (100 xx 10 ^(-6))^(2))/((4)^(2)))`
`" " = 5.625 N,` parallel to AB
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