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 energy stored using capacitor energy equations. while avoiding forgetting the square dependence on potential difference?.
- A.field-case-29: Apply Calculate energy stored using capacitor energy equations. within Energy stored by a capacitor.
- B.field-case-29: Treat Energy stored by a capacitor as separate from Capacitance, so the measured field idea is not used.
- C.field-case-29: Choose a memorised equation without checking direction, sign, field geometry or units.
- D.field-case-29: 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-29: Apply Calculate energy stored using capacitor energy equations.
- within Energy stored by a capacitor.
Explanation
Why this works
It is correct because it keeps the reasoning inside Energy stored by a capacitor and answers the approved learning objective: Calculate energy stored using capacitor energy equations. 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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