Question detail
Which response uses the correct technical wording for this situation? Context: relay switch circuit AC-output. Learning objective: (Physics only) (HT only) Link the motion of the coil or cone to pressure variations in the surrounding air.. Which answer is most accurate for Loudspeakers (physics only) (HT only)? Distinct revision anchor: fluxcue518a coilcue518b fieldcue518c polecue518d gridcue518e motorcue518f generatorcue518g transformercue518h compasscue518i currentcue518j voltagecue518k forcecue518l.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The motor effect
Question
- A. Loudspeakers (physics only) (HT only): relay switch circuit AC-output shows (Physics only) (HT only) Link the motion of the coil or cone to pressure variations in the surrounding air. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It reverses the role of primary and secondary coils. (field-shape error).
- C. It assumes transformers work on direct current without changing flux. (current-change error).
- D. It states the turns ratio changes resistance rather than voltage. (voltage-change error).
Answer
Loudspeakers (physics only) (HT only): relay switch circuit AC-output shows (Physics only) (HT only) Link the motion of the coil or cone to pressure variations in the surrounding air. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Loudspeakers (physics only) (HT only): relay switch circuit AC-output shows (Physics only) (HT only) Link the motion of the coil or cone to pressure variations in the surrounding air. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Loudspeakers (physics only) (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The relay switch circuit AC-output detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue518a coilcue518b fieldcue518c polecue518d gridcue518e motorcue518f generatorcue518g transformercue518h compasscue518i currentcue518j voltagecue518k forcecue518l: 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
motor-effect force direction: avoid motors and generators
Treating motors and generators as interchangeable when answering about motor-effect force direction.
Instead, identify the exact Unit 4.7 idea in Loudspeakers (physics only) (HT only), then explain how it links to a steel core electromagnet demonstration and the objective to link the motion of the coil or cone to pressure variations in the surrounding air.
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