Magnetism and electromagnetismQuestion 873 of 1506

A ferromagnetic core keeps some flux when the coil current is reduced to zero. The reversed current must overcome that flux. What is this lag called?

  1. Saturation
  2. Reluctance
  3. Self-induction
  4. Hysteresis
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Correct answer: Hysteresis

Retentivity makes the material hold its magnetization, so flux lags the force when the direction reverses.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 14.4: Permeability and Saturation

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Questions last reviewed: 18 October 2026