Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using transformer oil of better quality.
 increasing the number of turns.
 using soft material for winding.
 using the magnetic core of low reluctance.

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Electrical Machines
The coil spam

  may or may not be exactly equal to people pitch.
 can never be equal to pole pitch.
 must be exactly equal to people pitch.
 none of above.

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