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Suppose a hollow iron/steel ball is magnetised from the inside by placing a magnet inside. Will the magnetic field on the outside of the steel ball be fairly uniform? Does anyone know if there's any way to visualise the magnetic field in such a setting?

I'm asking because I'm trying to magnetise a hollow steel ball so that it can make contact with another steel ball. I want to see if the magnetised ball rotates, the other ball will also rotate but in a reverse direction.

Thanks

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