When a magnet moves relative to a coil, the induced e.m.f. is independent of which factor____________?
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Answer: A. resistance of the coil
Explanation
Induced electromotive force depends entirely on the rate of change of magnetic flux linkages. The internal resistance of the coil determines the resulting current flow, not the voltage. Faraday's law of induction dictates that resistance plays no role in the induced e.m.f. equation. Faraday's law states that any change in the magnetic environment of a coil induces a voltage. Electrical resistance opposes current flow but does not affect the magnitude of generated voltage. Magnetic flux linkage is the product of magnetic flux and the number of coil turns.
Electric generators convert mechanical energy into electrical energy using electromagnetic induction principles. Understanding induced e.m.f. helps engineers design efficient transformers and electrical rotating machinery. Coil resistance causes thermal losses during operation but remains independent of open-circuit voltage generation. The motion of the magnet directly dictates the rate of change of magnetic flux. The number of turns in the coil multiplies the total induced electromotive force. The pole strength of the magnet determines the total magnetic flux available for induction.
- Subject
- Engineering
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- Electrical Engineering
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- medium
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