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Faraday's first law of electromagnetic induction says that an emf is induced whenever
Acurrent in the circuit is constant (typical)
Bthe resistance changes
Cthe magnetic flux through a closed circuit changes
Dthe temperature rises
Answer & Solution
Correct answer: C. the magnetic flux through a closed circuit changes
1. Faraday observed that moving a magnet near a coil produced current.
2. Generalising: any change in flux Φ linked with a closed loop induces an emf.
3. Hence the first law: a changing magnetic flux is required.
_Source: Maharashtra Balbharati Std XII Physics, Ch 12 "Electromagnetic Induction" §12.2_
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