Electrical mathQuestion 864 of 1506

A coil has 400 turns and carries 1.5 A. What is its magnetomotive force?

  1. 600 ampere-turns
  2. 266.7 ampere-turns
  3. 401.5 ampere-turns
  4. 6000 ampere-turns
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Correct answer: 600 ampere-turns

mmf is current times turns: 1.5 A × 400 = 600 ampere-turns.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 14.2: Electromagnetism

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Questions last reviewed: 18 October 2026