Question detail
Select the statement that would earn credit in an AQA GCSE Physics answer. Context: step-up transformer demonstration 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: fluxcue425a coilcue425b fieldcue425c polecue425d gridcue425e motorcue425f generatorcue425g transformercue425h compasscue425i currentcue425j voltagecue425k forcecue425l.
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): step-up transformer demonstration 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 treats a permanent magnet as if it only works when current flows. (force-link error).
- C. It confuses the magnetic field with an electric field. (turns-ratio error).
- D. It describes energy transfer but misses the force or field interaction. (AC-output error).
Answer
Fleming's left-hand rule (HT only): step-up transformer demonstration 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): step-up transformer demonstration 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 step-up transformer demonstration current-change detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue425a coilcue425b fieldcue425c polecue425d gridcue425e motorcue425f generatorcue425g transformercue425h compasscue425i currentcue425j voltagecue425k forcecue425l: 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.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.