Magnets and electromagnets

4 lessons in Magnetism and electromagnetism.

38 exam questions · 95 marks

7.1 Magnets and magnetic fields Magnetic poles and forces, permanent and induced magnets, magnetic fields and field lines, plotting a field with compasses, and the Earth's magnetic field. AQA Edexcel OCR 9 questions 7.2 Electromagnetism: wires and solenoids The magnetic field around a current-carrying wire, the right-hand grip rule, solenoids and electromagnets, and what affects the strength of an electromagnet. AQA Edexcel OCR 10 questions 7.3 The motor effect and Fleming's left-hand rule Higher tier: the force on a current-carrying wire in a magnetic field (the motor effect), Fleming's left-hand rule, and the equation F = BIl with magnetic flux density in tesla. Higher only AQA Edexcel OCR 10 questions 7.4 Electric motors How a simple d.c. motor works: a coil in a magnetic field, the forces on its two sides, the split-ring commutator and brushes, and how to make it turn faster. AQA Edexcel OCR 9 questions