Question detail
Which option gives the strongest diagnostic reason? Context: solenoid strength investigation evidence. Learning objective: (Physics only) (HT only) Identify np and ns as the number of turns on the primary and secondary coils.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue741a coilcue741b fieldcue741c polecue741d gridcue741e motorcue741f generatorcue741g transformercue741h compasscue741i currentcue741j voltagecue741k forcecue741l.
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): solenoid strength investigation evidence shows (Physics only) (HT only) Identify np and ns as the number of turns on the primary and secondary coils. 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. (compass-response error).
- C. It confuses the magnetic field with an electric field. (pole-test error).
- D. It describes energy transfer but misses the force or field interaction. (load-effect error).
Answer
Transformers (HT only): solenoid strength investigation evidence shows (Physics only) (HT only) Identify np and ns as the number of turns on the primary and secondary coils. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): solenoid strength investigation evidence shows (Physics only) (HT only) Identify np and ns as the number of turns on the primary and secondary coils. 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 solenoid strength investigation evidence detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue741a coilcue741b fieldcue741c polecue741d gridcue741e motorcue741f generatorcue741g transformercue741h compasscue741i currentcue741j voltagecue741k forcecue741l: 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 student comparing motor and generator effects and the objective to identify np and ns as the number of turns on the primary and secondary coils.
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