Question detail
Which conclusion keeps the magnetism concept boundary clear? Context: classroom plotting compass turns-ratio. Learning objective: (Physics only) (HT only) Describe how variations in current in an electrical circuit are converted into pressure variations in sound waves.. Which answer is most accurate for Loudspeakers (physics only) (HT only)? Distinct revision anchor: fluxcue493a coilcue493b fieldcue493c polecue493d gridcue493e motorcue493f generatorcue493g transformercue493h compasscue493i currentcue493j voltagecue493k forcecue493l.
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): classroom plotting compass turns-ratio shows (Physics only) (HT only) Describe how variations in current in an electrical circuit are converted into pressure variations in sound waves. 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. (energy-transfer error).
- C. It confuses the magnetic field with an electric field. (field-shape error).
- D. It describes energy transfer but misses the force or field interaction. (current-change error).
Answer
Loudspeakers (physics only) (HT only): classroom plotting compass turns-ratio shows (Physics only) (HT only) Describe how variations in current in an electrical circuit are converted into pressure variations in sound waves. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Loudspeakers (physics only) (HT only): classroom plotting compass turns-ratio shows (Physics only) (HT only) Describe how variations in current in an electrical circuit are converted into pressure variations in sound waves. 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 classroom plotting compass turns-ratio detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue493a coilcue493b fieldcue493c polecue493d gridcue493e motorcue493f generatorcue493g transformercue493h compasscue493i currentcue493j voltagecue493k forcecue493l: 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 student comparing motor and generator effects and the objective to describe how variations in current in an electrical circuit are converted into pressure variations in sound waves.
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