Which option gives the strongest diagnostic reason? Context: primary-secondary coil comparison measurement. Learning objective: Describe how a compass needle points in the direction of the Earth's magnetic field.. Which answer is most accurate for Magnetic fields? Distinct revision anchor: fluxcue243a coilcue243b fieldcue243c polecue243d gridcue243e motorcue243f generatorcue243g transformercue243h compasscue243i currentcue243j voltagecue243k forcecue243l.

Magnetic fields: primary-secondary coil comparison measurement shows Describe how a compass needle points in the direction of the Earth's magnetic field. because magnetic effects depend on field direction, current or changing magnetic flux.

Magnetic fields: primary-secondary coil comparison measurement shows Describe how a compass needle points in the direction of the Earth's magnetic field. 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 primary-secondary coil comparison measurement detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue243a coilcue243b fieldcue243c polecue243d gridcue243e motorcue243f generatorcue243g transformercue243h compasscue243i currentcue243j voltagecue243k forcecue243l: 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.