Question detail

Which answer avoids the common misconception in this topic? Context: bicycle dynamo application. Learning objective: Describe how magnetic field strength depends on distance from the magnet.. Which answer is most accurate for Magnetic fields? Distinct revision anchor: fluxcue202a coilcue202b fieldcue202c polecue202d gridcue202e motorcue202f generatorcue202g transformercue202h compasscue202i currentcue202j voltagecue202k forcecue202l.

Try the question, check the answer, then read the explanation to understand the curriculum point.

At a glance

MCQ

Type

practice

Style

Topic

Permanent and induced magnetism, magnetic forces and fields

Question

  1. A. Magnetic fields: bicycle dynamo application shows Describe how magnetic field strength depends on distance from the magnet. because magnetic effects depend on field direction, current or changing magnetic flux.
  2. B. It reverses the role of primary and secondary coils. (comparison error).
  3. C. It assumes transformers work on direct current without changing flux. (safety error).
  4. D. It states the turns ratio changes resistance rather than voltage. (efficiency error).

Answer

Magnetic fields: bicycle dynamo application shows Describe how magnetic field strength depends on distance from the magnet. because magnetic effects depend on field direction, current or changing magnetic flux.

Explanation

Magnetic fields: bicycle dynamo application shows Describe how magnetic field strength depends on distance from the magnet. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Magnetic fields, uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The bicycle dynamo application detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue202a coilcue202b fieldcue202c polecue202d gridcue202e motorcue202f generatorcue202g transformercue202h compasscue202i currentcue202j voltagecue202k forcecue202l: 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

generator-effect induction: avoid permanent and induced magnets

Treating permanent and induced magnets as interchangeable when answering about generator-effect induction.

Instead, identify the exact Unit 4.7 idea in Magnetic fields, then explain how it links to a loudspeaker coil moving in a magnetic field and the objective to describe how magnetic field strength depends on distance from the magnet.

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