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Faraday's law of electromagnetic induction states that the induced emf around a closed circuit equals
AThe magnetic flux through the circuit
BThe rate of change of magnetic flux through the circuit, with a negative sign
CThe total current in the circuit
DThe resistance of the circuit
Answer & Solution
Correct answer: B. The rate of change of magnetic flux through the circuit, with a negative sign
ε = − dΦ_B/dt. The minus sign embeds Lenz's law (opposing change). The magnitude depends only on how fast flux changes, not flux itself.
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