When Lenz's force is removed in the AC generator head, what happens?

[Overunity Electricity]

Lenz's force is the force produced by Faraday's electromagnetic induction. It is also known as the back electromagnetic field (BACK EMF). If this force is removed by an electronic circuit connected to the windings on the stator, then the magnet on the rotor is free, it only depends on the friction and the kinetic energy supplied to the rotor.

This is the basis for generating free energy through the connection of the induction motor to the AC generator head.

See this issue in detail: Top Magnetic Generator

If you are not familiar with Back EMF: Harness the power of Back EMF for Free Energy

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That is the basis of self-powered (free energy) generators. Magnetic generators also use the power of magnets through permanent unbalance.