| 释义 |
Arago's disk Arago's disk[′a·rə‚gōz ‚disk] (electromagnetism) A device consisting of a horizontal disk of copper that can rotate about a vertical axis in an airtight box, and a horizontal bar magnet suspended above the disk but outside the box; upon rapid rotation of the disk, the bar magnet is deflected and eventually rotates in the same direction with smaller velocity. |