Exam-style question
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In the field-superposition case scenario, two masses or charges create a combined field at a test point. Which option best applies the AQA A-Level Physics objective to calculate force on a conductor in a magnetic field. while avoiding adding scalar potentials as if they were vector forces?.
- A.field-case-25: Apply Calculate force on a conductor in a magnetic field. within Magnetic flux density.
- B.field-case-25: Treat Magnetic flux density as separate from Magnetic fields, so the measured field idea is not used.
- C.field-case-25: Choose a memorised equation without checking direction, sign, field geometry or units.
- D.field-case-25: 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-25: 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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