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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...

  • answered twice already -

    I have answered this one twice as well
    ^ means exponent
    times 2 for two spheres forcing third

  • physics -

  • physics -

    thank you for responding:

    i did:


    using this i got 3.1. so then i need to double it because it's two spheres. right?

    and sorry about the formula in the question. i confused my self with the "times" and "exponent".

  • physics -

    cos 30 = 1/2

    so 9*16 /4 and figure out decimal= 36 *10^(9-12+2)

    = 3.6

  • physics -

    oh sorry, cos 30 = .866


  • physics -

    thank you. this was very helpful.

  • physics -

    You are welcome.

  • physics -

    Im working on this same question too and i cant figure out how you got the .5 when doing 3.6*.866/.5 ??? because i know the answer is correct, is it because the net force goes through the middle?

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