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Time-varying magnetic field outside a solenoid

  1. Apr 5, 2013 #1
    something that has had me confused:

    How can I calculate the time varying magnetic field produced by a solenoid, outside the solenoid along the axis of the core. I know that:

    inside the solenoid : apply amperes law
    For DC (magnetostatic) case outside the solenoid : apply Biot-savart law

    but what about a AC (time varying field) outside the solenoid? is the attenuation calculated like in EM waves attenuation and skin-depth? I also read something about replacing biot-savart with Jefimenko's equations if magnetostatics does not apply. Or is this not possible to calculate analytically.

    What is going on?
  2. jcsd
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