Question detail
Which explanation best links the observation to the physics? Context: step-down charger transformer compass-response. Learning objective: (Physics only) (HT only) Recall the factors that affect the direction of the induced potential difference or induced current.. Which answer is most accurate for Induced potential (HT only)? Distinct revision anchor: fluxcue570a coilcue570b fieldcue570c polecue570d gridcue570e motorcue570f generatorcue570g transformercue570h compasscue570i currentcue570j voltagecue570k forcecue570l.
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 compass-response shows (Physics only) (HT only) Recall the factors that affect the direction of the induced potential difference or induced current. 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 compass-response shows (Physics only) (HT only) Recall the factors that affect the direction of the induced potential difference or induced current. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Induced potential (HT only): step-down charger transformer compass-response shows (Physics only) (HT only) Recall the factors that affect the direction of the induced potential difference or induced current. 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 compass-response detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue570a coilcue570b fieldcue570c polecue570d gridcue570e motorcue570f generatorcue570g transformercue570h compasscue570i currentcue570j voltagecue570k forcecue570l: 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 step-up transformer on the National Grid and the objective to recall the factors that affect the direction of the induced potential difference or induced current.
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