Question detail
Select the statement that would earn credit in an AQA GCSE Physics answer. Context: step-up transformer demonstration boundary. Learning objective: (Physics only) (HT only) Explain how the ratio of potential differences across the two coils depends on the ratio of turns on each coil.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue761a coilcue761b fieldcue761c polecue761d gridcue761e motorcue761f generatorcue761g transformercue761h compasscue761i currentcue761j voltagecue761k forcecue761l.
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): step-up transformer demonstration boundary shows (Physics only) (HT only) Explain how the ratio of potential differences across the two coils depends on the ratio of turns on each coil. 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. (force-link error).
- C. It confuses the magnetic field with an electric field. (turns-ratio error).
- D. It describes energy transfer but misses the force or field interaction. (AC-output error).
Answer
Transformers (HT only): step-up transformer demonstration boundary shows (Physics only) (HT only) Explain how the ratio of potential differences across the two coils depends on the ratio of turns on each coil. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): step-up transformer demonstration boundary shows (Physics only) (HT only) Explain how the ratio of potential differences across the two coils depends on the ratio of turns on each coil. 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 step-up transformer demonstration boundary detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue761a coilcue761b fieldcue761c polecue761d gridcue761e motorcue761f generatorcue761g transformercue761h compasscue761i currentcue761j voltagecue761k forcecue761l: 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 AC and DC
Treating AC and DC 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 steel core electromagnet demonstration and the objective to explain how the ratio of potential differences across the two coils depends on the ratio of turns on each coil.
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