Exam-style question
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In the motor-effect setup scenario, a current-carrying wire is placed between magnetic poles. Which option best applies the AQA A-Level Physics objective to calculate gravitational forces between masses. while avoiding confusing motor effect with electromagnetic induction?.
- A.field-case-58: Apply Calculate gravitational forces between masses. within Newton's law of gravitation.
- B.field-case-58: Treat Newton's law of gravitation as separate from Gravitational fields, so the measured field idea is not used.
- C.field-case-58: Choose a memorised equation without checking direction, sign, field geometry or units.
- D.field-case-58: 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-58: Apply Calculate gravitational forces between masses.
- within Newton's law of gravitation.
Explanation
Why this works
It is correct because it keeps the reasoning inside Newton's law of gravitation and answers the approved learning objective: Calculate gravitational forces between masses. 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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