Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be_____________?
Correct answer: B. doubled
- A. unaffected
- B. doubled
- C. halved
- D. quadrupled
Explanation
Using L = μN²A/l, doubling the turns multiplies inductance by four, while doubling the core length divides it by two. The net change is therefore 4/2 = 2, or doubled.
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