5K20.42 Arago's Disk

PURPOSE: To illustrate magnetic drag

DESCRIPTION: Dedicated apparatus (HP - 1638).

SETUP TIME: ???

COMPONENT LIST:

    


  1.  Apparatus HP - 1638				?????

SUGGESTIONS:

REFERENCES: 2122 4.998; PIRA 5K20.42

OTHER NOTES: "Some years before Faraday discovered the principles of induced emf's, Arago made a discovery which was not understood at the time. A horizontal disk of copper was mounted so that it could be set in rotation about a vertical axis. If a horizontal bar magnet was suspended over this disk, the bar wouldbe set in rotation in whichever direction the copper was turning. By some unseen force the magnet was dragged around by the moving plate. ...It was not until after the discovery of induced emf's that Arago's experiment was understood." From Physics, Third Edition, by O.M. Stewart, Ginn, 1939.