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April 21, 2012


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Hi there,

Thanks for the demostration. I think, it is because of the eddy currents which are induced in the coin and who create a magnetic flux in the opposite way of the original magnetic flux created by the coil. The resultant magnetic flux is the superposition of both and finally is less than the original magnetic flux.

==> for the same current in the coil:

Inductance = Magnetic_Flux / Current.

That means that, for the same current in the coil, the inductance decreases if the magneic flux magnetic flux decreases too.

John Dunn

That is precisely correct, Lofti.

I had left that out of the posting.

Prem Sobel

Ever hear of mumetal? :)

John Dunn

Of course, but ยต-metal can be costly and it has to be carefully handled to get the best performance. These sheets of steel and aluminum gave satisfactory results, we utterly rugged and were very cheap. Their effects on the shielded transformer windings simply needed to be taken into account.

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