Question detail
Which response uses the correct technical wording for this situation? Context: model railway motor voltage-change. Learning objective: (HT only) Apply MS 3b and MS 3c when using the motor-effect equation.. Which answer is most accurate for Fleming's left-hand rule (HT only)? Distinct revision anchor: fluxcue440a coilcue440b fieldcue440c polecue440d gridcue440e motorcue440f generatorcue440g transformercue440h compasscue440i currentcue440j voltagecue440k forcecue440l.
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): model railway motor voltage-change shows (HT only) Apply MS 3b and MS 3c when using the motor-effect equation. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It says field lines travel from south to north outside the magnet. (diagnosis error).
- C. It makes AC and DC equivalent. (prediction error).
- D. It ignores relative motion or changing magnetic flux. (comparison error).
Answer
Fleming's left-hand rule (HT only): model railway motor voltage-change shows (HT only) Apply MS 3b and MS 3c when using the motor-effect equation. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Fleming's left-hand rule (HT only): model railway motor voltage-change shows (HT only) Apply MS 3b and MS 3c when using the motor-effect equation. 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 model railway motor voltage-change detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue440a coilcue440b fieldcue440c polecue440d gridcue440e motorcue440f generatorcue440g transformercue440h compasscue440i currentcue440j voltagecue440k forcecue440l: 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 steel core electromagnet demonstration and the objective to apply MS 3b and MS 3c when using the motor-effect equation.
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