Exam-style question
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What is the principle behind electromagnetic induction in generators?.
- A.A changing magnetic field induces an emf
- B.A constant magnetic field induces an emf
- C.A changing electric field induces a magnetic field
- D.A constant electric field induces a magnetic field
Model answer
What a good answer should say
- A changing magnetic field induces an emf
Explanation
Why this works
Electromagnetic induction occurs when a conductor experiences a change in magnetic flux, which induces an electromotive force (emf) according to Faraday's law.
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