Question detail
Which explanation best links the observation to the physics? Context: step-down charger transformer energy-transfer. Learning objective: (Physics only) Apply WS 1.4 when explaining electromagnetic devices from diagrams.. Which answer is most accurate for Electromagnetism? Distinct revision anchor: fluxcue378a coilcue378b fieldcue378c polecue378d gridcue378e motorcue378f generatorcue378g transformercue378h compasscue378i currentcue378j voltagecue378k forcecue378l.
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. Electromagnetism: step-down charger transformer energy-transfer shows (Physics only) Apply WS 1.4 when explaining electromagnetic devices from diagrams. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It reverses the role of primary and secondary coils. (turns-ratio error).
- C. It assumes transformers work on direct current without changing flux. (AC-output error).
- D. It states the turns ratio changes resistance rather than voltage. (coil-core error).
Answer
Electromagnetism: step-down charger transformer energy-transfer shows (Physics only) Apply WS 1.4 when explaining electromagnetic devices from diagrams. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Electromagnetism: step-down charger transformer energy-transfer shows (Physics only) Apply WS 1.4 when explaining electromagnetic devices from diagrams. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Electromagnetism, uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The step-down charger transformer energy-transfer detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue378a coilcue378b fieldcue378c polecue378d gridcue378e motorcue378f generatorcue378g transformercue378h compasscue378i currentcue378j voltagecue378k forcecue378l: 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 Electromagnetism, then explain how it links to a loudspeaker coil moving in a magnetic field and the objective to apply WS 1.4 when explaining electromagnetic devices from diagrams.
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