Question detail
Which conclusion keeps the magnetism concept boundary clear? Context: school bell electromagnet voltage-change. Learning objective: (HT only) Apply MS 3b and MS 3c when using the motor-effect equation.. Which answer is most accurate for Fleming's left-hand rule (HT only)? Distinct revision anchor: fluxcue439a coilcue439b fieldcue439c polecue439d gridcue439e motorcue439f generatorcue439g transformercue439h compasscue439i currentcue439j voltagecue439k forcecue439l.
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. Fleming's left-hand rule (HT only): school bell electromagnet voltage-change shows (HT only) Apply MS 3b and MS 3c when using the motor-effect equation. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It swaps motor and generator reasoning. (measurement error).
- C. It describes gravitational force instead of magnetic force. (diagnosis error).
- D. It claims induced current is supplied by a cell. (prediction error).
Answer
Fleming's left-hand rule (HT only): school bell electromagnet voltage-change shows (HT only) Apply MS 3b and MS 3c when using the motor-effect equation. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Fleming's left-hand rule (HT only): school bell electromagnet voltage-change shows (HT only) Apply MS 3b and MS 3c when using the motor-effect equation. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Fleming's left-hand rule (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The school bell electromagnet voltage-change detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue439a coilcue439b fieldcue439c polecue439d gridcue439e motorcue439f generatorcue439g transformercue439h compasscue439i currentcue439j voltagecue439k forcecue439l: 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 Fleming's left-hand rule (HT only), then explain how it links to a steel core electromagnet demonstration and the objective to apply MS 3b and MS 3c when using the motor-effect equation.
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