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Distance dependence in Ampere's force law

  1. Jan 24, 2013 #1
    Hello,

    In the Ampere's force law

    F=2ka[itex]\frac{I_{1}I_{2}}{r}[/itex]

    Ampere law,

    the force between 2 parallel conductors doesn't seem to depend on the distance between them.

    F is given in [N/m], instead of just [N]...

    What is the rationale behind this?

    Thank you.
     
  2. jcsd
  3. Jan 24, 2013 #2
    Does it stem from the definition of Ampere
     
  4. Jan 24, 2013 #3
    Reading some other threads on the subject helps... I see that the force is per unit of cable length, while r on the RHS is the distance betw the 2 cables, okay :)
     
  5. Jan 24, 2013 #4
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