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  • lrhythm commented on mhkabir's instructable Recycled HDD Powertool (Disk of Prometheus)4 months ago
    Recycled HDD Powertool (Disk of Prometheus)

    All electrically conductive materials do resist a moving magnetic field. The material does not have to be ferromagnetic. The physics behind this is that a changing magnetic field induces a current in the conductive material which is immediately shorted out by the conductive material.When dragging a magnet by hand to determine whether the material is conductive(metal), a powerful magnetic field will product a more noticable effect; however, an aluminum disk platter is very thin and so the effect will be difficult to notice.The energy provided by the moving magnetic material becomes heat in the conductive material.See induction heating article at wikipedia for more information.

    All electrically conductive materials do resist a moving magnetic field. The material does not have to be ferromagnetic. The physics behind this is that a changing magnetic field induces a current in the conductive material which is immediately shorted out by the conductive material.When dragging a magnet by hand to determine whether the material is conductive, a powerful magnetic field will product a more noticable effect. The energy provided by the moving magnetic material becomes heat in the conductive material.See induction heating article at wikipedia for more information.

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