Electromagnetic induction

What is electromagnetic induction?

Electromagnetic induction is the generation of an electromotive force (EMF) in a conductor when the magnetic flux through it changes. Faraday's law: ε = −dΦ/dt, where Φ is magnetic flux linkage. Lenz's law (the minus sign) states that the induced EMF opposes the change causing it (conservation of energy). Applications: dynamos, transformers, induction cookers, eddy-current braking. AQA, Edexcel and OCR all examine flux-linkage graphs and the derivation of induced EMF.