Question detail
Which option gives the strongest diagnostic reason? Context: phone speaker coil cause. Learning objective: (Physics only) (HT only) Explain how an alternating current in one coil induces a current in another coil.. Which answer is most accurate for Transformers (HT only)? Distinct revision anchor: fluxcue705a coilcue705b fieldcue705c polecue705d gridcue705e motorcue705f generatorcue705g transformercue705h compasscue705i currentcue705j voltagecue705k forcecue705l.
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): phone speaker coil cause shows (Physics only) (HT only) Explain how an alternating current in one coil induces a current in another coil. 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. (prediction error).
- C. It confuses the magnetic field with an electric field. (comparison error).
- D. It describes energy transfer but misses the force or field interaction. (safety error).
Answer
Transformers (HT only): phone speaker coil cause shows (Physics only) (HT only) Explain how an alternating current in one coil induces a current in another coil. because magnetic effects depend on field direction, current or changing magnetic flux.
Explanation
Transformers (HT only): phone speaker coil cause shows (Physics only) (HT only) Explain how an alternating current in one coil induces a current in another coil. 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 phone speaker coil cause detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue705a coilcue705b fieldcue705c polecue705d gridcue705e motorcue705f generatorcue705g transformercue705h compasscue705i currentcue705j voltagecue705k forcecue705l: 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 magnetic field...
Treating magnetic field direction and force direction 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 an alternator producing an AC output trace and the objective to explain how an alternating current in one coil induces a current in another coil.
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