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eddy current

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    Eddy Current Brake with Iron Rotor?

    I was reading this Wikipedia article, https://en.wikipedia.org/wiki/Eddy_current_brake and I noticed that it says that the rotor in an eddy current break is non-ferromagnetic. But the picture on the article shows a rotor that looks like it's rusting. This makes me think that it's steel or iron...

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