Question detail

Which answer avoids the common misconception in this topic? Context: coil-and-galvanometer induction 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: fluxcue742a coilcue742b fieldcue742c polecue742d gridcue742e motorcue742f generatorcue742g transformercue742h compasscue742i currentcue742j voltagecue742k forcecue742l.

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): coil-and-galvanometer induction 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.
  2. B. It reverses the role of primary and secondary coils. (pole-test error).
  3. C. It assumes transformers work on direct current without changing flux. (load-effect error).
  4. D. It states the turns ratio changes resistance rather than voltage. (power-link error).

Answer

Transformers (HT only): coil-and-galvanometer induction 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): coil-and-galvanometer induction 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 coil-and-galvanometer induction evidence detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue742a coilcue742b fieldcue742c polecue742d gridcue742e motorcue742f generatorcue742g transformercue742h compasscue742i currentcue742j voltagecue742k forcecue742l: 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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AQA GCSE Physics Induced potential, transformers question detail | ExamCompanion