Question detail
Which answer avoids the common misconception in this topic? Context: temporary induced magnet direction. Learning objective: (Physics only) (HT only) Recognise that knowledge of laminations and eddy currents in the core is not required.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue700a coilcue700b fieldcue700c polecue700d gridcue700e motorcue700f generatorcue700g transformercue700h compasscue700i currentcue700j voltagecue700k forcecue700l.
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): temporary induced magnet direction shows (Physics only) (HT only) Recognise that knowledge of laminations and eddy currents in the core is not required. 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. (evidence error).
- C. It makes AC and DC equivalent. (boundary error).
- D. It ignores relative motion or changing magnetic flux. (application error).
Answer
Transformers (HT only): temporary induced magnet direction shows (Physics only) (HT only) Recognise that knowledge of laminations and eddy currents in the core is not required. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): temporary induced magnet direction shows (Physics only) (HT only) Recognise that knowledge of laminations and eddy currents in the core is not required. 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 temporary induced magnet direction detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue700a coilcue700b fieldcue700c polecue700d gridcue700e motorcue700f generatorcue700g transformercue700h compasscue700i currentcue700j voltagecue700k forcecue700l: 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 magnetic field...
Treating magnetic field direction and force direction 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 loudspeaker coil moving in a magnetic field and the objective to recognise that knowledge of laminations and eddy currents in the core is not required.
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