Question detail
Which explanation best links the observation to the physics? Context: scrapyard lifting magnet field-shape. Learning objective: (HT only) State that the magnet producing the field and the conductor exert a force on each other.. Which answer is most accurate for Fleming's left-hand rule (HT only)? Distinct revision anchor: fluxcue390a coilcue390b fieldcue390c polecue390d gridcue390e motorcue390f generatorcue390g transformercue390h compasscue390i currentcue390j voltagecue390k forcecue390l.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The motor effect
Question
- A. Fleming's left-hand rule (HT only): scrapyard lifting magnet field-shape shows (HT only) State that the magnet producing the field and the conductor exert a force on each other. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It reverses the role of primary and secondary coils. (application error).
- C. It assumes transformers work on direct current without changing flux. (measurement error).
- D. It states the turns ratio changes resistance rather than voltage. (diagnosis error).
Answer
Fleming's left-hand rule (HT only): scrapyard lifting magnet field-shape shows (HT only) State that the magnet producing the field and the conductor exert a force on each other. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Fleming's left-hand rule (HT only): scrapyard lifting magnet field-shape shows (HT only) State that the magnet producing the field and the conductor exert a force on each other. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Fleming's left-hand rule (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The scrapyard lifting magnet field-shape detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue390a coilcue390b fieldcue390c polecue390d gridcue390e motorcue390f generatorcue390g transformercue390h compasscue390i currentcue390j voltagecue390k forcecue390l: in the motor effect, the force is perpendicular to the current and magnetic field; in a generator, relative motion or a changing magnetic field induces a potential difference or induced current; outside a magnet, magnetic field lines go from north to south; AC alternating current changes direction, while DC direct current flows in one direction and needs a commutator in a DC generator context.
Common mistake
motor-effect force direction: avoid motors and generators
Treating motors and generators as interchangeable when answering about motor-effect force direction.
Instead, identify the exact Unit 4.7 idea in Fleming's left-hand rule (HT only), then explain how it links to a dynamo producing a DC output trace and the objective to state that the magnet producing the field and the conductor exert a force on each other.
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