A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?
Correct answer: D. 48 mH
- A. 6 mH
- B. 14 mH
- C. 24 mH
- D. 48 mH
Explanation
For the same core geometry, inductance varies as the square of the number of turns, L ∝ N². Doubling the turns therefore makes 12 mH become 12 × 2² = 48 mH.
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