The emf produced by the motion of a coil across the magnetic field is called:
Correct answer: A. Motional emf
- A. Motional emf
- B. emf
- C. Induced emf
- D. None of the above
Explanation
The electromotive force (emf) produced by the motion of a coil across a magnetic field is specifically referred to as Motional emf. Motional emf refers to the electromotive force induced in a conductor or coil when it moves through a magnetic field at a constant velocity. This phenomenon is described by Faraday's law of electromagnetic induction, which states that the rate of change of magnetic flux through a circuit induces an emf in the circuit. When the coil moves through the magnetic field, the magnetic flux linked with the coil changes, resulting in an 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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