Nomen Nescio  wrote:
> "R.Wieser"  wrote:
>
>> You know, that sounds a lot more believable than what I thought I gleaned
>> from the article : "In order to keep the disturbances of the magnetic
>> compasses of passing ships as small as possible, a bipolar cable was used".
>
> The keyword here being "bipolar" in contrast to a monopolar cable with
> return currents passed through the water (e.g.
> https://en.wikipedia.org/wiki/Baltic_Cable )
>
> A DC current produces a magnetic field around the wire. In a bipolar cable,
> both fields mostly cancel each other out.
>
>

Of course, the same is true for an AC cable, and twisting the two
conductors improves the cancellation in either case.

--
-michael - NadaNet 3.1 and AppleCrate II:  http://michaeljmahon.com

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