According to Faraday's law of electromagnetic induction, what determines the magnitude of induced electromotive force (EMF) in a coil?
Answer and explanation
Correct answer: B. The rate of change of magnetic flux
- Step 1: Faraday's law states .
- Step 2: The induced EMF is directly proportional to the time rate of change of magnetic flux linkage through the circuit.
- Step 3: Static fields produce zero induced EMF.
Answer
The rate of change of magnetic flux.
Why not the others: 'The magnitude of the static magnetic field' produces no EMF without temporal variation; 'The electrical resistance of the wire' governs current, not EMF; 'The temperature of the conducting coil' affects resistance, not induced voltage.
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