The source of induced e.m.f is:
Correct answer: D. Relative motion between magnet and coil
- A. Cell
- B. Battery
- C. Interaction between stationary magnet and coil
- D. Relative motion between magnet and coil
Explanation
The source of induced electromotive force (e.m.f.) is D) Relative motion between a magnet and a coil. When there's a change in the magnetic field lines passing through a coil, induced e.m.f. is generated in the coil according to Faraday's law of electromagnetic induction. This occurs when there's motion between a magnetic field (such as that of a magnet) and a coil or conductor, leading to the generation of an induced current or voltage.
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About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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