Electrical mathQuestion 800 of 1506

The diameter of a round wire is doubled. What happens to its cross-sectional area?

  1. It doubles
  2. It quadruples
  3. It stays the same
  4. It is cut in half
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Correct answer: It quadruples

Area depends on the square of the diameter: 2² = 4.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 12.2: Conductor Size

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Questions last reviewed: 18 October 2026