Exam-style question
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In the practical investigation of magnetic flux linkage using a search coil, explain why the induced electromotive force (emf) is proportional to the rate of change of magnetic flux through the coil.
Model answer
What a good answer should say
- The induced emf is given by Faraday’s law, which states that the emf equals the negative rate of change of magnetic flux linkage.
- When the magnetic field or the coil area changes, the flux linkage changes, and the faster this change, the larger the induced emf.
- This proportionality allows the search coil to detect variations in magnetic flux by measuring the induced voltage.
Explanation
Why this works
The answer demonstrates understanding of Faraday’s law and the relationship between flux change and induced emf, which is central to the practical. It tests the ability to link a physical law to an experimental observation.
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