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as a magnet pair passes over a coil , inducing a voltage, that voltage is most dependent on ?

1) the angular velocity ( thats a given)

2) the pole strength

3) flux density

4) energy product.

5) thickness of the magnet ( not the width / length or diameter)

Assuming the diameter of the magnet is in the correct proportion to the coil for a three phase generator how is the the thickness of the magnet related to the induced voltage?

I have experimented with this , using 7/8" dia x 1/2" and 7/8" dia x 1" NdFeB magnets , with the same air gap , same coil , doubling the thickness only produced a 15 percent increase in voltage . why?

I was expecting to double the induced voltage .