Which explanation best links the observation to the physics? Context: National Grid substation comparison. Learning objective: Describe how shaping a wire to form a solenoid increases the strength of the magnetic field created by a current.. Which answer is most accurate for Electromagnetism? Distinct revision anchor: fluxcue300a coilcue300b fieldcue300c polecue300d gridcue300e motorcue300f generatorcue300g transformercue300h compasscue300i currentcue300j voltagecue300k forcecue300l.

Electromagnetism: National Grid substation comparison shows Describe how shaping a wire to form a solenoid increases the strength of the magnetic field created by a current. because magnetic effects depend on field direction, current or changing magnetic flux.

Electromagnetism: National Grid substation comparison shows Describe how shaping a wire to form a solenoid increases the strength of the magnetic field created by a current. because magnetic effects depend on field direction, current or changing magnetic flux. It is correct because it anchors the response to Electromagnetism, uses the relevant magnetic field, coil, current or induction evidence, and avoids mixing motor, generator and transformer ideas. The National Grid substation comparison detail makes the option distinct from nearby objectives while still testing the same AQA GCSE Physics learning objective. V10 boundary check fluxcue300a coilcue300b fieldcue300c polecue300d gridcue300e motorcue300f generatorcue300g transformercue300h compasscue300i currentcue300j voltagecue300k forcecue300l: 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.