The coupling coefficient of perfectly coupled coil is:
Correct answer: B. 1
- A. Zero
- B. 1
- C. More than 1
- D. Infinite
Explanation
The coupling coefficient (k) is a measure of how efficiently magnetic flux is transferred between two coils. In a perfectly coupled system, all the magnetic flux from one coil is coupled to the other, resulting in a coupling coefficient of 1. This is the ideal scenario for applications like transformers, where efficient energy transfer is desired.Option A: Zero - Incorrect, as a coefficient of zero means no flux linkage, which is the opposite of perfect coupling.Option C: More than 1 - Incorrect because a coefficient greater than 1 is not possible in reality, as it implies an unrealistic scenario of flux linkage.Option D: Infinite - Incorrect, as infinity is not a viable value for coupling coefficient in physical systems.
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About Transformers
Transformers transfer alternating electrical energy between coils by mutual induction, with voltage ratio determined by the turns ratio. The topic covers step-up and step-down transformers, current changes, ideal power conservation and practical losses such as heating and flux leakage. A transformer requires changing magnetic flux, so it does not operate with steady direct current.
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