assume you mean 10^-6 C
2(K)Cos30((4.0*10-6)^2)/(0.2^2)
2 * 9*10^9 (1/2) (4*10^-6)^2/.04
3.6 Newtons
Three spheres, each with a negative chrge of 4.0x10^6C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Calculate the magnitude and direction of the net electric force on each spehere.
i used this: (K)Cos30((4.0*10-6)*2)/(0.2*2)
and i get 3.1 every time...
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