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How much work must be done to bring three electrons from a great distance apart to within 2.1×10−10 {\rm m} from one another (at the corners of an equilateral triangle)?

  • Physics -

    Let a be the separation. I do not understand your 1×10−10 {\rm } notation for a

    Bringing in the first electron requires no work.
    Bringing in the second electron required k^e^2/a

    Bringing in the third electron requires

    The total work required is
    3 k e^2/a

    k is the Coulomb constanmt

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