The ratio of the emf in the secondary coil to the rate of change of current in the primary coil is known as:
Correct answer: D. Both (a) and (c)
- A. Mutual induction
- B. Self induction
- C. Mutual inductance
- D. Both (a) and (c)
Explanation
The correct answer is Both (a) and (c).There are two key concepts at play here:Mutual induction: This refers to the phenomenon where a changing magnetic field in one coil induces an electromotive force (emf) in another coil that is nearby.Mutual inductance: This is a property of two coupled coils that quantifies the strength of their mutual induction. It is measured in henries (H) and represents the ratio of the induced emf in the secondary coil to the rate of change of current in the primary coil.So, while mutual induction describes the underlying phenomenon, mutual inductance is the specific mathematical concept that measures its strength using the aforementioned ratio. Therefore, both terms are relevant in this context.
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About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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