Arago`s rotations

Arago`s rotations is an observable phenomenon and effect discovered by Fran├žois Arago in 1824. In the effect, as a copper disc is rotated in its own plane, and if a magnetic needle be freely suspended on a pivot over the disc, the needle will rotate with the disc. If on the other hand the needle is fixed it will tend to retard the motion of the ....
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