SACE Stage 2 Physics — Electricity & Magnetism 2.5

Faraday & Lenz

A bar magnet sliding through a coil changes the flux through every turn. Faraday's law gives the size of the induced EMF — ε = −N·dΦ/dt — and Lenz's law gives the sign: the induced current opposes the change in flux. Drag the magnet (or auto-sweep) to see Φ and ε track in real time.