Question detail
Which explanation best links the observation to the physics? Context: step-down charger transformer AC-output. Learning objective: (Physics only) (HT only) Describe how a potential difference is induced across a conductor when the conductor moves relative to a magnetic field.. Which answer is most accurate for Induced potential (HT only)? Distinct revision anchor: fluxcue522a coilcue522b fieldcue522c polecue522d gridcue522e motorcue522f generatorcue522g transformercue522h compasscue522i currentcue522j voltagecue522k forcecue522l.
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. Induced potential (HT only): step-down charger transformer AC-output shows (Physics only) (HT only) Describe how a potential difference is induced across a conductor when the conductor moves relative to a magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It reverses the role of primary and secondary coils. (turns-ratio error).
- C. It assumes transformers work on direct current without changing flux. (AC-output error).
- D. It states the turns ratio changes resistance rather than voltage. (coil-core error).
Answer
Induced potential (HT only): step-down charger transformer AC-output shows (Physics only) (HT only) Describe how a potential difference is induced across a conductor when the conductor moves relative to a magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Induced potential (HT only): step-down charger transformer AC-output shows (Physics only) (HT only) Describe how a potential difference is induced across a conductor when the conductor moves relative to a magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Induced potential (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The step-down charger transformer AC-output detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue522a coilcue522b fieldcue522c polecue522d gridcue522e motorcue522f generatorcue522g transformercue522h compasscue522i currentcue522j voltagecue522k forcecue522l: 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 Induced potential (HT only), then explain how it links to a bar magnet and plotting compass practical and the objective to describe how a potential difference is induced across a conductor when the conductor moves relative to a magnetic field.
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