The inductance of a coil will increase under all the following conditions except______________?
Correct answer: A. when more length for the same number of turns is provided
- A. when more length for the same number of turns is provided
- B. when the number of turns of the coil increase
- C. when more area for each turn is provided
- D. when permeability of the core increases
Explanation
For a coil, L = μN²A/l, so increasing the magnetic-path length l while keeping turns, area and permeability unchanged reduces inductance. Increasing turns, area, or permeability increases it.
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