Electrical mathQuestion 803 of 1506

A wire has a diameter of 0.050 inch. What is the diameter in mils?

  1. 500 mils
  2. 0.5 mils
  3. 5 mils
  4. 50 mils
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Correct answer: 50 mils

1 mil is 1/1000 inch, so 0.050 in × 1000 = 50 mils.

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

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Questions last reviewed: 18 October 2026