Demagnetization factors of ringcores

The expression for the demagnetization of ringcores has evolved from the eq uation for the magnetic field inside simple-shaped objects whose magnetizat ion is uniform. A modified expression that allows for the angular distribut ion of the magnetic held in the ringcore is developed from calculations for a infinite length tube, The modified expression is shown to provide a good fit to measured data. This modified equation is important when the product of the relative permeability and the demagnetization constant has a value around one or less.