Select the statement that would earn credit in an AQA GCSE Physics answer. Context: power-station transformer measurement. Learning objective: Describe a magnetic compass as containing a small bar magnet.. Which answer is most accurate for Magnetic fields? Distinct revision anchor: fluxcue227a coilcue227b fieldcue227c polecue227d gridcue227e motorcue227f generatorcue227g transformercue227h compasscue227i currentcue227j voltagecue227k forcecue227l.

Magnetic fields: power-station transformer measurement shows Describe a magnetic compass as containing a small bar magnet. because magnetic effects depend on field direction, current or changing magnetic flux.

Magnetic fields: power-station transformer measurement shows Describe a magnetic compass as containing a small bar 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 power-station transformer measurement detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue227a coilcue227b fieldcue227c polecue227d gridcue227e motorcue227f generatorcue227g transformercue227h compasscue227i currentcue227j voltagecue227k forcecue227l: 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.