Understanding Magneto Voltage: How Does a Magneto Work?

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Cherryboba
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Hey guys, I was wondering how a magneto works exactly?

I have been reading a lot, but I do not understand why the voltage spikes when the magnetic field collapses. Any help?
 

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The voltage spikes when The B field collapses because we have a big change in magnetic flux. Faradays law. A time varying B field induces an E field.
 

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