Question detail

Select the statement that would earn credit in an AQA GCSE Physics answer. Context: power-station transformer field-shape. Learning objective: (HT only) Use Fleming's left-hand rule to represent the relative orientation of force, current and magnetic field.. Which answer is most accurate for Fleming's left-hand rule (HT only)? Distinct revision anchor: fluxcue395a coilcue395b fieldcue395c polecue395d gridcue395e motorcue395f generatorcue395g transformercue395h compasscue395i currentcue395j voltagecue395k forcecue395l.

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

At a glance

MCQ

Type

practice

Style

Topic

The motor effect

Question

  1. A. Fleming's left-hand rule (HT only): power-station transformer field-shape shows (HT only) Use Fleming's left-hand rule to represent the relative orientation of force, current and magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux.
  2. B. It swaps motor and generator reasoning. (safety error).
  3. C. It describes gravitational force instead of magnetic force. (efficiency error).
  4. D. It claims induced current is supplied by a cell. (energy-transfer error).

Answer

Fleming's left-hand rule (HT only): power-station transformer field-shape shows (HT only) Use Fleming's left-hand rule to represent the relative orientation of force, current and magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux.

Explanation

Fleming's left-hand rule (HT only): power-station transformer field-shape shows (HT only) Use Fleming's left-hand rule to represent the relative orientation of force, current and magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Fleming's left-hand rule (HT only), uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The power-station transformer field-shape detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue395a coilcue395b fieldcue395c polecue395d gridcue395e motorcue395f generatorcue395g transformercue395h compasscue395i currentcue395j voltagecue395k forcecue395l: 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

motor-effect force direction: avoid motors and generators

Treating motors and generators as interchangeable when answering about motor-effect force direction.

Instead, identify the exact Unit 4.7 idea in Fleming's left-hand rule (HT only), then explain how it links to a moving-coil microphone investigation and the objective to use Fleming's left-hand rule to represent the relative orientation of force, current and magnetic field.

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