Exam-style question
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A coil is placed in a changing magnetic field. Explain how Lenz's law applies to the induced emf in the coil.
Model answer
What a good answer should say
- Lenz's law states that the direction of the induced emf will be such that it opposes the change in magnetic flux through the coil.
- If the magnetic field increases, the induced emf will generate a current that produces a magnetic field opposing the increase.
Explanation
Why this works
This answer effectively explains the application of Lenz's law to induced emf, demonstrating a clear understanding of the relationship between magnetic flux changes and induced effects. It tests the student's ability to articulate the principles of electromagnetic induction.
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