Magnetism and electromagnetism

Magnetism and electromagnetism explores the fundamental forces that govern magnetic fields, their interactions with materials, and how electricity can create magnetism. This topic is central to understanding how devices like electric motors, loudspeakers, and generators work. You'll learn about permanent magnets, induced magnets, and the magnetic field patterns around bar magnets and current-carrying wires. The key idea is that moving charges (currents) produce magnetic fields, and these fields can exert forces on other currents or magnetic materials.

In the AQA Combined Science specification, this topic builds on your knowledge of electricity and forces. It's split into two main areas: permanent magnetism (including magnetic materials and field lines) and electromagnetism (including the motor effect and Fleming's left-hand rule). Understanding these concepts is crucial for later topics like electromagnetic induction and transformers, which appear in the Physics (Triple Science) course. For Combined Science, you need to focus on the motor effect and how to determine the direction of force on a current-carrying wire in a magnetic field.

This topic is highly practical and appears in many everyday technologies. From MRI scanners to doorbells, electromagnets are everywhere. Mastering this content will not only help you in exams but also give you insight into how much of modern technology operates. Expect to draw and interpret magnetic field patterns, use Fleming's left-hand rule, and calculate the force on a conductor using F = BIL.