Exam-style question
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Which law explains the direction of induced emf in a transformer?.
- A.Faraday's law
- B.Lenz's law
- C.Ohm's law
- D.Newton's law
Model answer
What a good answer should say
- Lenz's law
Explanation
Why this works
Lenz's law states that the direction of the induced emf will be such that it opposes the change in magnetic flux that produced it, which is crucial for understanding transformer action.
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