How can I demonstrate the relationship of the electromotive force of a motor AC
Motional emf will be induced in the rotor. Use E=BLVsinθ*N (where v=rw and N=number of turns of rotor).
For detailed demo, you can first prove the motional emf equation using Lorentz's force(F=BILsinθ) applied on electrons of a conductor and then apply the emf equation to this alternator.
which force you talk about ???
the rectangle is fixed and the flow varies,
I think to use the flow of magnetic induction,
I think to use Faraday's relationship e = - dΦ / dt (the derivative currency flows on derivative temp).
in using Φ=∫∫ B.dS
Then you should use Faraday's laws.
but i find this expression : E = N L r w B cos(wt)
====> must find sin (wt) instead of cos (wt)
Then you should assume the varying flux as a cosine wave.
i have cos(wt) not sin(wt) !!
Your varying flux function should be predefined, either sin or cos. If it is sin, emf will be in cos(wt).
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