Question detail

Which option gives the strongest diagnostic reason? Context: solenoid strength investigation cause. Learning objective: (Physics only) (HT only) State that the ratio of the potential differences across the primary and secondary coils depends on the ratio of the number of turns on each coil.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue717a coilcue717b fieldcue717c polecue717d gridcue717e motorcue717f generatorcue717g transformercue717h compasscue717i currentcue717j voltagecue717k forcecue717l.

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

  1. A. Transformers (HT only): solenoid strength investigation cause shows (Physics only) (HT only) State that the ratio of the potential differences across the primary and secondary coils depends on the ratio of the number of turns on each coil. because magnetic effects depend on field direction, current or changing magnetic flux.
  2. B. It treats a permanent magnet as if it only works when current flows. (compass-response error).
  3. C. It confuses the magnetic field with an electric field. (pole-test error).
  4. D. It describes energy transfer but misses the force or field interaction. (load-effect error).

Answer

Transformers (HT only): solenoid strength investigation cause shows (Physics only) (HT only) State that the ratio of the potential differences across the primary and secondary coils depends on the ratio of the number of turns on each coil. because magnetic effects depend on field direction, current or changing magnetic flux.

Explanation

Transformers (HT only): solenoid strength investigation cause shows (Physics only) (HT only) State that the ratio of the potential differences across the primary and secondary coils depends on the ratio of the number 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 solenoid strength investigation cause detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue717a coilcue717b fieldcue717c polecue717d gridcue717e motorcue717f generatorcue717g transformercue717h compasscue717i currentcue717j voltagecue717k forcecue717l: 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 moving-coil microphone investigation and the objective to state that the ratio of the potential differences across the primary and secondary coils depends on the ratio of the number of turns on each coil.

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