Here is the real motor:

In order to make motor reach stable rotational motion. A friction force is introduced: F=-constant *b*omage;//where b is the width in y-direction
Even thought magnitude of the magnetic force is the same (black arrows),
 the torque is a function of cos(w*t)



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If the process is reversed: A loop rotating in a uniform magnetic field will become electric power generator.
Please check out [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=915.0]A loop rotating in a magnetic field (How electric power generator works!)[/url]

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