Which explanation best links the observation to the physics? Context: laboratory bar magnet diagnosis. Learning objective: Explain how the behaviour of a magnetic compass is evidence that the core of the Earth must be magnetic.. Which answer is most accurate for Magnetic fields? Distinct revision anchor: fluxcue264a coilcue264b fieldcue264c polecue264d gridcue264e motorcue264f generatorcue264g transformercue264h compasscue264i currentcue264j voltagecue264k forcecue264l.

Magnetic fields: laboratory bar magnet diagnosis shows Explain how the behaviour of a magnetic compass is evidence that the core of the Earth must be magnetic. because magnetic effects depend on field direction, current or changing magnetic flux.

Magnetic fields: laboratory bar magnet diagnosis shows Explain how the behaviour of a magnetic compass is evidence that the core of the Earth must be magnetic. 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 laboratory bar magnet diagnosis detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue264a coilcue264b fieldcue264c polecue264d gridcue264e motorcue264f generatorcue264g transformercue264h compasscue264i currentcue264j voltagecue264k forcecue264l: 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.