Ive been doing some reading up about this and Im a little confused as to=20
whether its caused by an interaction between the magnetic field induced=20
in the rotor pushing against the magnietic field from the stator or=20
whether there is a thrust induced on the rotor itself just from the=20
having current flow through it. Reading about Flemings Left hand rule=20
suggests the latter but if that were so surely transformers and inductor=20
coils would move!?

On 22/02/2011 12:50, Olin Lathrop wrote:
> Andrew Wood wrote:
>> What phenomenon is responsible for it becoming harder to turn?
> Magnetic forces from the current.  As current flows, the magnetic field
> produced by that current apposes the motion of the magnets in the other p=
art
> (rotor/stator) of the generator.
>
>
--=20
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