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Eddy currents

An aluminium cylinder rotates as it falls through a uniform magnetic field. Let it be falling in the y direction and the field direction be z. When its axis of rotation is perpendicular to the field direction (along the x axis), it slows down. When it is parallel to the field direction there is no braking. Why?

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If a large conductive metallic object is moved through a magnetic field which intersects perpendicularly to it, the magnetic field will induce small "rings" of current which will actually create internal magnetic fields opposing ...