Question detail
Which response uses the correct technical wording for this situation? Context: relay switch circuit field-shape. Learning objective: (HT only) Use Fleming's left-hand rule to represent the relative orientation of force, current and magnetic field.. Which answer is most accurate for Fleming's left-hand rule (HT only)? Distinct revision anchor: fluxcue398a coilcue398b fieldcue398c polecue398d gridcue398e motorcue398f generatorcue398g transformercue398h compasscue398i currentcue398j voltagecue398k forcecue398l.
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): relay switch circuit field-shape shows (HT only) Use Fleming's left-hand rule to represent the relative orientation of force, current and magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It reverses the role of primary and secondary coils. (field-shape error).
- C. It assumes transformers work on direct current without changing flux. (current-change error).
- D. It states the turns ratio changes resistance rather than voltage. (voltage-change error).
Answer
Fleming's left-hand rule (HT only): relay switch circuit field-shape shows (HT only) Use Fleming's left-hand rule to represent the relative orientation of force, current and magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Fleming's left-hand rule (HT only): relay switch circuit field-shape shows (HT only) Use Fleming's left-hand rule to represent the relative orientation of force, current and magnetic field. 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 relay switch circuit field-shape detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue398a coilcue398b fieldcue398c polecue398d gridcue398e motorcue398f generatorcue398g transformercue398h compasscue398i currentcue398j voltagecue398k forcecue398l: 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 moving-coil microphone investigation and the objective to use Fleming's left-hand rule to represent the relative orientation of force, current and magnetic field.
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