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Magnets are commonly used in magnetic exercise bikes as brakes for increasing resistance:

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where the black wheel is a piece of cast iron. I was wondering if (significantly) more eddy currents would be induced if the cast iron was slightly magnetised, e.g., attaching a piece of magnet on the black wheel. Does the polarity matter?

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The eddy currents inducted into a metal are determined by its conductivity, which, generally, would not be increased due to its magnetization.

So, magnetizing the disc or attaching a magnet to it would not improve the brake action.

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