Question detail
Which explanation best links the observation to the physics? Context: scrapyard lifting magnet exam-command. Learning objective: (Physics only) (HT only) Describe how pressure variations in sound waves are converted into variations in current in electrical circuits.. Which answer is most accurate for Microphones (HT only)? Distinct revision anchor: fluxcue654a coilcue654b fieldcue654c polecue654d gridcue654e motorcue654f generatorcue654g transformercue654h compasscue654i currentcue654j voltagecue654k forcecue654l.
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. Microphones (HT only): scrapyard lifting magnet exam-command shows (Physics only) (HT only) Describe how pressure variations in sound waves are converted into variations in current in electrical circuits. because magnetic effects depend on field direction, current or changing magnetic flux.
- B. It reverses the role of primary and secondary coils. (application error).
- C. It assumes transformers work on direct current without changing flux. (measurement error).
- D. It states the turns ratio changes resistance rather than voltage. (diagnosis error).
Answer
Microphones (HT only): scrapyard lifting magnet exam-command shows (Physics only) (HT only) Describe how pressure variations in sound waves are converted into variations in current in electrical circuits. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Microphones (HT only): scrapyard lifting magnet exam-command shows (Physics only) (HT only) Describe how pressure variations in sound waves are converted into variations in current in electrical circuits. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Microphones (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The scrapyard lifting magnet exam-command detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue654a coilcue654b fieldcue654c polecue654d gridcue654e motorcue654f generatorcue654g transformercue654h compasscue654i currentcue654j voltagecue654k forcecue654l: 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 motors and generators
Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.
Instead, identify the exact Unit 4.7 idea in Microphones (HT only), then explain how it links to a step-down transformer for a low-voltage device and the objective to describe how pressure variations in sound waves are converted into variations in current in electrical circuits.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.