Exam-style question
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In the radial-field sketch scenario, field lines around a point charge or spherical mass are compared. Which option best applies the AQA A-Level Physics objective to use Faraday's law to calculate induced emf. while avoiding drawing uniform parallel lines for a radial field?.
- A.field-case-12: Apply Use Faraday's law to calculate induced emf. within Electromagnetic induction.
- B.field-case-12: Treat Electromagnetic induction as separate from Magnetic fields, so the measured field idea is not used.
- C.field-case-12: Choose a memorised equation without checking direction, sign, field geometry or units.
- D.field-case-12: Replace the A-Level fields reasoning with a broad GCSE label only.
Model answer
What a good answer should say
- The correct option is field-case-12: Apply Use Faraday's law to calculate induced emf.
- within Electromagnetic induction.
Explanation
Why this works
It is correct because it keeps the reasoning inside Electromagnetic induction and answers the approved learning objective: Use Faraday's law to calculate induced emf. The other options are weaker because they switch to the wrong fields concept, ignore the measured quantity, lose direction or sign information, or use a generic statement instead of A-Level Physics reasoning.
Common mistake
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