Exam-style question
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Using Faraday's law, describe how the induced emf can be calculated when the magnetic flux changes over time.
Model answer
What a good answer should say
- The induced emf (ε) can be calculated using Faraday's law, which states that ε = -dΦ/dt, where Φ is the magnetic flux.
- The negative sign indicates the direction of the induced emf opposes the change in flux, as per Lenz's law.
Explanation
Why this works
This answer effectively summarizes Faraday's law and incorporates Lenz's law, demonstrating a comprehensive understanding of the relationship between changing magnetic flux and induced emf. The question assesses the student's ability to apply theoretical knowledge to practical calculations.
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