GCSE Physics: Magnetism and Electromagnetism

Magnetism closes the GCSE Physics course, building from bar magnets to the motor effect that powers most of the machines around us. This quiz covers the full progression, with every arrangement described in words so spatial reasoning is done in your head, as the hardest exam questions require.

The magnetostatics questions cover the foundations: permanent versus induced magnets, like poles repelling, the bar magnet's field pattern — strongest at the poles, running from north to south — and how a plotting compass reveals it, including which way the needle points near a north pole and what happens to its deflection as it moves away from a current-carrying wire. The Earth's own magnetic field appears as the reason compasses work at all.

The electromagnetism questions centre on the current-field connection: the field around a straight wire strengthening with current, and the solenoid as the practical amplifier — more turns, more current, and an iron core each boosting an electromagnet, with a dedicated question on why soft iron (which magnetises and demagnetises instantly) beats steel for the job. Applications where switchable magnetism is the whole point — electric bells, scrapyard cranes — are tested against fixed-magnet decoys.

The Higher tier material addresses the motor effect: a current-carrying conductor in a magnetic field experiences a force perpendicular to both the current and the field, and Fleming's left-hand rule assigns the direction — exercised in a fully worded configuration (field left to right across a page, current into the page, force down the page). The explanations spell out the finger-by-finger reasoning, building exactly the spatial vocabulary that motor-effect questions demand. No formula recall is required anywhere, consistent with the equations sheet arrangement.

• Distinguish permanent from induced magnets and describe the bar magnet field pattern
• Use a plotting compass to infer field direction and strength
• Explain how current, turns and an iron core strengthen an electromagnet
• Justify the choice of soft iron over steel in electromagnets and name applications
• Apply Fleming's left-hand rule to find the force direction in the motor effect (Higher)

Topic scope follows the Magnetism and electromagnetism section of the Department for Education's GCSE combined science and physics subject content: permanent and induced magnetism, magnetic fields, electromagnets and solenoids, and (Higher) the motor effect with Fleming's left-hand rule.