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demondoppel
Lv 5
demondoppel asked in Science & MathematicsPhysics · 1 decade ago

Magnetic field collapsing by coil inductance and frequency?

If I were to place a rare earth magnet inside a fine copper wound coil and then pass a certain amount of AC at 15khz through the coil, thus cancelling out the magnetic field on the rare earth magnet at very small intervals...what would happen?

Curious to what people wold think would happen...

Update:

thanks all..

What if the proportioning were equal and it was a DC pulsed waveform at 15khz?

I am trying to understand if a power gain could be created...due to the magnetic field collapse while under vibration.

2 Answers

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  • zee_prime
    Lv 6
    1 decade ago
    Favorite Answer

    In principle you can demagnetise a permanent magnet like this, but rare earth magnets have such high coercivity that probably nothing would happen.

  • doug_donaghue
    Lv 7
    1 decade ago

    You'd get a 15KHz AC field component (with a strength proportional to the current through the coil) with a fixed 'offset' proportional to the strength of the rare earth magnet.

    Doug

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