According to Faraday's law of electromagnetic induction, what induces an electromotive force (EMF) in a closed conductive loop?
Answer and explanation
Correct answer: C. A change in magnetic flux through the loop over time
- Step 1: State Faraday's law: induced EMF = -N * (delta Phi / delta t).
- Step 2: Electromagnetic induction requires a time-varying magnetic flux.
- Step 3: A static magnetic field produces zero induced EMF because delta Phi / delta t = 0.
Answer
A change in magnetic flux through the loop over time.
Why not the others: 'A constant uniform magnetic field perpendicular to the loop' produces zero rate of flux change; 'A constant electric charge located inside the loop' produces static electric fields without inductive EMF; 'The electrostatic potential difference across the boundaries' confuses electrostatics with induction.
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