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Magnetic field, in inches?

Discussion in 'Electronic Basics' started by js5895, May 1, 2005.

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  1. js5895

    js5895 Guest

    Hi,

    Can I calculate the magnetic field around a wire in inches, I have
    voltage and current.
    Also, the magnetic field around a wire is cylindrical.

    Thanks, for helping.
     
  2. In air or vacuum, for an infinitely long wire, the strength
    B of the magnetic field surrounding it at a radius r is:
    B(r) = u0 * I / (2 Pi r)
    where u0 is the permeability of free space (4e-7 * Pi),
    B is in Tesla, r is in meters, and I is in Amperes. You
    can do the conversions. The voltage is irrelevant.
    The direction of the field is perpindicular to both the
    wire and the normal from the given point to the wire.
    This describes the static field for a DC current. For
    AC currents and not r << wavelength, the above is
    not the right equation, due to field propagation.
    Welcome.
     
  3. js5895

    js5895 Guest

    Thanks, but, I think I went over my head on this one. :)
     
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