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 force on a conductor in a magnetic field. while avoiding confusing motor effect with electromagnetic induction?.
- A.field-case-26: Apply Calculate force on a conductor in a magnetic field. within Magnetic flux density.
- B.field-case-26: Treat Magnetic flux density as separate from Magnetic fields, so the measured field idea is not used.
- C.field-case-26: Choose a memorised equation without checking direction, sign, field geometry or units.
- D.field-case-26: 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-26: Apply Calculate force on a conductor in a magnetic field.
- within Magnetic flux density.
Explanation
Why this works
It is correct because it keeps the reasoning inside Magnetic flux density and answers the approved learning objective: Calculate force on a conductor in a magnetic field. 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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