Exam-style question
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In the capacitor-energy store scenario, energy stored by a charged capacitor is compared before and after changing voltage. Which option best applies the AQA A-Level Physics objective to calculate flux linkage for coils in magnetic fields. while avoiding forgetting the square dependence on potential difference?.
- A.field-case-13: Apply Calculate flux linkage for coils in magnetic fields. within Magnetic flux and flux linkage.
- B.field-case-13: Treat Magnetic flux and flux linkage as separate from Magnetic fields, so the measured field idea is not used.
- C.field-case-13: Choose a memorised equation without checking direction, sign, field geometry or units.
- D.field-case-13: 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-13: Apply Calculate flux linkage for coils in magnetic fields.
- within Magnetic flux and flux linkage.
Explanation
Why this works
It is correct because it keeps the reasoning inside Magnetic flux and flux linkage and answers the approved learning objective: Calculate flux linkage for coils in magnetic fields. 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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