Question detail

Which response uses the correct technical wording for this situation? Context: relay switch circuit exam-command. Learning objective: (Physics only) (HT only) Explain how a moving-coil microphone works.. Which answer is most accurate for Microphones (HT only)? Distinct revision anchor: fluxcue662a coilcue662b fieldcue662c polecue662d gridcue662e motorcue662f generatorcue662g transformercue662h compasscue662i currentcue662j voltagecue662k forcecue662l.

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. Microphones (HT only): relay switch circuit exam-command shows (Physics only) (HT only) Explain how a moving-coil microphone works. because magnetic effects depend on field direction, current or changing magnetic flux.
  2. B. It reverses the role of primary and secondary coils. (field-shape error).
  3. C. It assumes transformers work on direct current without changing flux. (current-change error).
  4. D. It states the turns ratio changes resistance rather than voltage. (voltage-change error).

Answer

Microphones (HT only): relay switch circuit exam-command shows (Physics only) (HT only) Explain how a moving-coil microphone works. because magnetic effects depend on field direction, current or changing magnetic flux.

Explanation

Microphones (HT only): relay switch circuit exam-command shows (Physics only) (HT only) Explain how a moving-coil microphone works. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Microphones (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The relay switch circuit exam-command detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue662a coilcue662b fieldcue662c polecue662d gridcue662e motorcue662f generatorcue662g transformercue662h compasscue662i currentcue662j voltagecue662k forcecue662l: 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 motors and generators

Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.

Instead, identify the exact Unit 4.7 idea in Microphones (HT only), then explain how it links to a student comparing motor and generator effects and the objective to explain how a moving-coil microphone works.

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