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Homework Help: Magnitude of magnetic field

  1. Feb 23, 2010 #1
    Hi there, i am facing a question that seem quite simple, i just do not know what formula to use.

    the questions is:

    A long straight wire carries a current of 2.5 A. Find the magnitude of the magnetic field 25 cm from the wire.

    I = 2.5 A
    0.025 m
  2. jcsd
  3. Feb 23, 2010 #2
    Hi. That's on the same vein as the one I asked a few threads ago. Find the equation that shows the magnitude B or a magnetic field at a distance r (clue: it's the one with the permeability of free space constant in). Hope that helps
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