Red Seal Electrician Practice
Magnetism and electromagnetismQuestion 870 of 1506

A magnetic core is made longer, with the same cross-section and material. What happens to its reluctance?

  1. It increases.
  2. It decreases.
  3. It stays the same.
  4. It becomes zero.
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Correct answer: It increases.

A longer path gives more opposition to flux, as a longer wire has more resistance.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 14.3: Magnetic Units of Measurement

Practice magnetism and electromagnetism

Questions last reviewed: 18 October 2026