Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Lenz's law.
 Fleming's left hand rule.
 Fleming's right hand rule.
 Ampere law.

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Electrical Machines
Cogging and crawling are phenomena associated with

 any of the above.
 the former during starting and the latter at a fraction of its rated speed.
 cage induction machines and they are essentially the same.
 the former at a fraction of its rate speed and the latter during starting.

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