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A current-carrying conductor is placed in the field of a permanent magnet and a force is observed. By Newton's third law the magnet

  • A.experiences an equal and opposite force
  • B.experiences no force
  • C.experiences a torque but no force
  • D.experiences a force in the same direction as the conductor

Answer: A

The interaction is mutual, so the magnet is pushed the other way with the same force, and in a motor that reaction is taken by the frame. Forgetting the reaction is a common slip in analysing the mechanics of a machine.

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