Question detail

Which answer avoids the common misconception in this topic? Context: coil-and-galvanometer induction coil-core. Learning objective: (Physics only) (HT only) State that an induced current generates a magnetic field that opposes the original change.. Which answer is most accurate for Induced potential (HT only)? Distinct revision anchor: fluxcue550a coilcue550b fieldcue550c polecue550d gridcue550e motorcue550f generatorcue550g transformercue550h compasscue550i currentcue550j voltagecue550k forcecue550l.

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

  1. A. Induced potential (HT only): coil-and-galvanometer induction coil-core shows (Physics only) (HT only) State that an induced current generates a magnetic field that opposes the original change. because magnetic effects depend on field direction, current or changing magnetic flux.
  2. B. It reverses the role of primary and secondary coils. (pole-test error).
  3. C. It assumes transformers work on direct current without changing flux. (load-effect error).
  4. D. It states the turns ratio changes resistance rather than voltage. (power-link error).

Answer

Induced potential (HT only): coil-and-galvanometer induction coil-core shows (Physics only) (HT only) State that an induced current generates a magnetic field that opposes the original change. because magnetic effects depend on field direction, current or changing magnetic flux.

Explanation

Induced potential (HT only): coil-and-galvanometer induction coil-core shows (Physics only) (HT only) State that an induced current generates a magnetic field that opposes the original change. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Induced potential (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The coil-and-galvanometer induction coil-core detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue550a coilcue550b fieldcue550c polecue550d gridcue550e motorcue550f generatorcue550g transformercue550h compasscue550i currentcue550j voltagecue550k forcecue550l: 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 induced and supplied...

Treating induced and supplied current as interchangeable when answering about National Grid transformer reasoning.

Instead, identify the exact Unit 4.7 idea in Induced potential (HT only), then explain how it links to an alternator producing an AC output trace and the objective to state that an induced current generates a magnetic field that opposes the original change.

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