| 摘要 |
The first magnet ( 9 ) is set free to tumble within a tumbling chamber ( 10 ). A coil ( 11 ) wound around the out surface of the tumbling chamber ( 10 ). The two ends of the coil ( 11 ) are connected to the terminals of an LED (light emitting diode) ( 3 ). There may be some arbitrary, relative motion between the first magnet ( 9 ) and the second magnet ( 2 ). The magnets depicted with dotted lines represent alternative, relative motions of the second magnet ( 2 ) with respect to the first magnet ( 9 ). As the first magnet ( 9 ) and the second magnet ( 2 ) pass close to one another, the mutual interaction of the magnetic fields is sufficient to cause the first magnet ( 9 ) to tumble in the tumbling chamber ( 10 ). As the first magnet ( 9 ) tumbles in the tumbling chamber ( 10 ), a varying magnetic filed flux is effected through the coil ( 11 ) and a corresponding electric current flows through the coil ( 11 ) thus illuminating the LED 3.
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