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Math Help - why electric field appears here..

  1. #1
    MHF Contributor
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    why electric field appears here..

    http://i31.tinypic.com/2rnvvhf.jpg
    the electrons and protons are separated till
    electric field appears and stops the separations

    i cant understand why suddenly electric field apears
    from what principle it appears.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by transgalactic View Post
    http://i31.tinypic.com/2rnvvhf.jpg
    the electrons and protons are separated till
    electric field appears and stops the separations

    i cant understand why suddenly electric field apears
    from what principle it appears.
    If you introduce a (small) test charge it will experience an electrostatic (Coulomb) force due to the charges, hence by definition there is an electric field.

    CB
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