In electromagnetic induction, an electromotive force (e.m.f.) is induced in a coil due to the change of flux through the coil, when the coil is
Correct answer: D. moved in a magnetic field.
- A. placed in an electric field.
- B. moved in an electric field.
- C. placed in a magnetic field.
- D. moved in a magnetic field.
Explanation
The correct answer is Option D. When a coil is moved in a magnetic field, the magnetic flux through the coil changes, inducing an electromotive force (e.m.f.) according to Faraday's law of electromagnetic induction. Option A and B are incorrect because an electric field alone does not cause induction in a coil. Option C is incorrect because merely being placed in a static magnetic field does not change the flux and thus does not induce an e.m.f.
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About Faraday's Law
Faraday's law states that an induced electromotive force equals the rate of change of magnetic flux linkage through a circuit. Questions cover changing field, area, angle or motion, the negative sign associated with Lenz's law, and the distinction between induced emf and the current that may flow in a closed circuit.
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