Question detail
Which explanation best links the observation to the physics? Context: laboratory bar magnet boundary. Learning objective: (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue768a coilcue768b fieldcue768c polecue768d gridcue768e motorcue768f generatorcue768g transformercue768h compasscue768i currentcue768j voltagecue768k forcecue768l.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Induced potential, transformers and the National Grid (physics only) (HT only)
Question
- A. Transformers (HT only): laboratory bar magnet boundary shows (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It says field lines travel from south to north outside the magnet. (power-link error).
- C. It makes AC and DC equivalent. (exam-command error).
- D. It ignores relative motion or changing magnetic flux. (direction error).
Answer
Transformers (HT only): laboratory bar magnet boundary shows (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): laboratory bar magnet boundary shows (Physics only) (HT only) Calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Transformers (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The laboratory bar magnet boundary detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue768a coilcue768b fieldcue768c polecue768d gridcue768e motorcue768f generatorcue768g transformercue768h compasscue768i currentcue768j voltagecue768k forcecue768l: 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
National Grid transformer reasoning: avoid primary and secondary...
Treating primary and secondary coils as interchangeable when answering about National Grid transformer reasoning.
Instead, identify the exact Unit 4.7 idea in Transformers (HT only), then explain how it links to a current-carrying wire between magnetic poles and the objective to calculate primary potential difference, secondary potential difference, primary turns or secondary turns using transformer ratios.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.