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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...

  • physics -

    assume you mean 10^-6 C


    2 * 9*10^9 (1/2) (4*10^-6)^2/.04

    3.6 Newtons

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