A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?
Correct answer: B. variation in voltage to the coil
- A. variation in coil current
- B. variation in voltage to the coil
- C. change of number of turns of coil
- D. the resistance of magnetic path
Explanation
The self-induced emf is governed by e = L(di/dt), with inductance depending on turns and magnetic-path reluctance; applied voltage is not a direct defining factor. A voltage change can alter current indirectly, but it does not directly determine the coil's inductance.
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