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Convert watts to Teslas?

Discussion in 'Electronic Design' started by John Larkin, Sep 27, 2005.

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  1. John  Larkin

    John Larkin Guest


    No. You have to know the coil current and the geometry, and do the
    math.

    John
     
  2. Lester Crane

    Lester Crane Guest

    I realize this depends somewhat on emitter coil efficiency ... but
    given an air core solenoid and sinusoidal audio frequency signal, is
    there anyway to approximate how many microTeslas I will get per mW?

    Much thanks,

    Lester
     
  3. Tim Williams

    Tim Williams Guest

    None, inductance is lossless. <BG>

    You might have luck with VAr or volts however...

    Tim
     
  4. Robert Baer

    Robert Baer Guest

    NO!
    Measure it; the magnetic field will vary with the signal / drive.
     
  5. Robert Baer

    Robert Baer Guest

    And ampere-turns..
     
  6. I read in sci.electronics.design that Lester Crane <>
    No, because the field strength varies wildly with where you measure it.

    In any case, you don't need ANY watts to produce the field (except for a
    very short time during which the field is set up). Power dissipated in
    the coil is just I^2R, and you can get the same field from any value of
    R from zero (superconducting coil) to large (thin wire, many volts
    required to produce the required current).

    If you say what you are actually trying to do, I may well be able to
    help. This is an area in which I do a lot of work.
     
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