Arago's rotations

Arago's rotations is an observable phenomenon and effect discovered by François Arago in 1824. In the effect, as a copper disc is rotated in its own plane and passing through the field of a magnet, and if a magnetic needle is freely suspended on a pivot over the disc, the needle will rotate with the disc. On the other hand, if the needle is fixed it will tend to retard the motion of the disc.

The transfer of force or torque is the same as in eddy current braking and magnetic damping.

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