Exam-style question
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In the capacitor-discharge trace scenario, a capacitor discharge graph is used to infer the time constant. Which option best applies the AQA A-Level Physics objective to describe alternating current using period, frequency and peak value. while avoiding assuming charge falls linearly?.
- A.field-case-08: Apply Describe alternating current using period, frequency and peak value. within Alternating currents.
- B.field-case-08: Treat Alternating currents as separate from Magnetic fields, so the measured field idea is not used.
- C.field-case-08: Choose a memorised equation without checking direction, sign, field geometry or units.
- D.field-case-08: 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-08: Apply Describe alternating current using period, frequency and peak value.
- within Alternating currents.
Explanation
Why this works
It is correct because it keeps the reasoning inside Alternating currents and answers the approved learning objective: Describe alternating current using period, frequency and peak value. 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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