Magnetism and electromagnetismQuestion 1072 of 1506

A coil has 200 turns and carries 3 A. What is its magnetomotive force?

  1. 67 amp-turns
  2. 203 amp-turns
  3. 600 amp-turns
  4. 1800 amp-turns
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Correct answer: 600 amp-turns

mmf = N × I = 200 × 3 = 600 amp-turns.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.1: Mutual Inductance and Basic Operation

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Questions last reviewed: 18 October 2026