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A conductor carrying current in a slot experiences a force that acts to

  • A.push it across the slot toward the tooth wall
  • B.compress it against the bottom of the slot
  • C.twist it about its own axis
  • D.push it along the slot toward one end

Answer: D

The flux crossing the slot is largely radial and the current axial, so the cross product gives a force in the circumferential direction, across the slot. It is taken by the slot walls and the wedge, and it is what drives the rotor round.

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