Question detail
Which conclusion keeps the magnetism concept boundary clear? Context: moving-wire motor effect boundary. Learning objective: (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue769a coilcue769b fieldcue769c polecue769d gridcue769e motorcue769f generatorcue769g transformercue769h compasscue769i currentcue769j voltagecue769k forcecue769l.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Induced potential, transformers and the National Grid (physics only) (HT only)
Question
- A. Transformers (HT only): moving-wire motor effect boundary shows (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It treats a permanent magnet as if it only works when current flows. (exam-command error).
- C. It confuses the magnetic field with an electric field. (direction error).
- D. It describes energy transfer but misses the force or field interaction. (cause error).
Answer
Transformers (HT only): moving-wire motor effect boundary shows (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): moving-wire motor effect boundary shows (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Transformers (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The moving-wire motor effect boundary detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue769a coilcue769b fieldcue769c polecue769d gridcue769e motorcue769f generatorcue769g transformercue769h compasscue769i currentcue769j voltagecue769k forcecue769l: 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
National Grid transformer reasoning: avoid primary and secondary...
Treating primary and secondary coils as interchangeable when answering about National Grid transformer reasoning.
Instead, identify the exact Unit 4.7 idea in Transformers (HT only), then explain how it links to a current-carrying wire between magnetic poles and the objective to calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios.
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