Question detail
Which answer avoids the common misconception in this topic? Context: bicycle dynamo energy-transfer. Learning objective: (Physics only) Interpret diagrams of electromagnetic devices in order to explain how they work.. Which answer is most accurate for Electromagnetism? Distinct revision anchor: fluxcue370a coilcue370b fieldcue370c polecue370d gridcue370e motorcue370f generatorcue370g transformercue370h compasscue370i currentcue370j voltagecue370k forcecue370l.
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: bicycle dynamo energy-transfer shows (Physics only) Interpret diagrams of electromagnetic devices in order to explain how they work. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It reverses the role of primary and secondary coils. (comparison error).
- C. It assumes transformers work on direct current without changing flux. (safety error).
- D. It states the turns ratio changes resistance rather than voltage. (efficiency error).
Answer
Electromagnetism: bicycle dynamo energy-transfer shows (Physics only) Interpret diagrams of electromagnetic devices in order to explain how they work. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Electromagnetism: bicycle dynamo energy-transfer shows (Physics only) Interpret diagrams of electromagnetic devices in order to explain how they work. 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 bicycle dynamo energy-transfer detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue370a coilcue370b fieldcue370c polecue370d gridcue370e motorcue370f generatorcue370g transformercue370h compasscue370i currentcue370j voltagecue370k forcecue370l: 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 current-carrying wire between magnetic poles and the objective to interpret diagrams of electromagnetic devices in order to explain how they work.
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