The emf induced in the secondary coil is directly proportional to:
Correct answer: A. Rate of change of magnetic flux
- A. Rate of change of magnetic flux
- B. Rate change of electric flux
- C. Change of magnetic flux
- D. All of above
Explanation
The electromotive force (EMF) induced in the secondary coil of a transformer is directly proportional to the rate of change of magnetic flux. This relationship is described by Faraday's law of electromagnetic induction, which states that the induced EMF in a circuit is equal to the rate of change of magnetic flux through the circuit. So, the correct option is: Rate of change of magnetic flux
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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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