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work /electric potential question..

Discussion in 'Mathematics and Physics' started by transgalactic, Sep 7, 2009.

  1. transgalactic

    transgalactic Banned

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    i know that work i the difference between the potential in the end
    and the potential in the start.

    but when i have this fds=qEds
    and using the law of work
    i dont know how to get to

    dU=-qEds

    how to get the minus
    ??
     
  2. transgalactic

    transgalactic Banned

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    here we have the same work threw difference in potentials
    but we dont have a minus

    why??
    http://i30.tinypic.com/f9h16a.jpg

    why in one case we have minus
    and in the other we dont?
     
    Last edited: Sep 8, 2009
  3. Sydney

    Sydney New Member

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    Location:
    In the bush in Australia
    The minus charge is one side of the cap and q is the charge

    Think outside the square and square it
     

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