The induced emf in a circuit depends upon:
Correct answer: D. Rate of change of magnetic flux
- A. Maximum magnetic flux
- B. Change in magnetic flux
- C. Initial magnetic flux
- D. Rate of change of magnetic flux
Explanation
The induced electromotive force (emf) in a circuit depends upon Rate of change of magnetic flux.According to Faraday's law of electromagnetic induction, the induced emf in a circuit is directly proportional to the rate of change of magnetic flux through the circuit. Mathematically, this can be expressed as: EMF=− dΦ/dtWhere:EMF is the induced electromotive force,dΦ/dt is the rate of change of magnetic flux.The initial magnetic flux, change in magnetic flux, and maximum magnetic flux are not directly involved in determining the magnitude of the induced emf. Instead, it is the rate at which the magnetic flux through the circuit is changing that governs the induced emf.
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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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