Question detail
Which response uses the correct technical wording for this situation? Context: relay switch circuit safety. Learning objective: Define an electromagnet as a solenoid with an iron core.. Which answer is most accurate for Electromagnetism? Distinct revision anchor: fluxcue326a coilcue326b fieldcue326c polecue326d gridcue326e motorcue326f generatorcue326g transformercue326h compasscue326i currentcue326j voltagecue326k forcecue326l.
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: relay switch circuit safety shows Define an electromagnet as a solenoid with an iron core. 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
Electromagnetism: relay switch circuit safety shows Define an electromagnet as a solenoid with an iron core. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Electromagnetism: relay switch circuit safety shows Define an electromagnet as a solenoid with an iron core. 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 relay switch circuit safety detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue326a coilcue326b fieldcue326c polecue326d gridcue326e motorcue326f generatorcue326g transformercue326h compasscue326i currentcue326j voltagecue326k forcecue326l: 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 step-up transformer on the National Grid and the objective to define an electromagnet as a solenoid with an iron core.
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