Question detail
Which conclusion keeps the magnetism concept boundary clear? Context: iron-filings field pattern current-change. Learning objective: (HT only) Identify force F in newtons, magnetic flux density B in tesla, current I in amperes and length l in metres.. Which answer is most accurate for Fleming's left-hand rule (HT only)? Distinct revision anchor: fluxcue427a coilcue427b fieldcue427c polecue427d gridcue427e motorcue427f generatorcue427g transformercue427h compasscue427i currentcue427j voltagecue427k forcecue427l.
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): iron-filings field pattern current-change shows (HT only) Identify force F in newtons, magnetic flux density B in tesla, current I in amperes and length l in metres. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It swaps motor and generator reasoning. (AC-output error).
- C. It describes gravitational force instead of magnetic force. (coil-core error).
- D. It claims induced current is supplied by a cell. (compass-response error).
Answer
Fleming's left-hand rule (HT only): iron-filings field pattern current-change shows (HT only) Identify force F in newtons, magnetic flux density B in tesla, current I in amperes and length l in metres. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Fleming's left-hand rule (HT only): iron-filings field pattern current-change shows (HT only) Identify force F in newtons, magnetic flux density B in tesla, current I in amperes and length l in metres. 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 iron-filings field pattern current-change detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue427a coilcue427b fieldcue427c polecue427d gridcue427e motorcue427f generatorcue427g transformercue427h compasscue427i currentcue427j voltagecue427k forcecue427l: 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 calculation using primary and secondary coils and the objective to identify force F in newtons, magnetic flux density B in tesla, current I in amperes and length l in metres.
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