Induced Currents: Feynman's Physics Explained
Faraday discovered that a changing magnetic field creates an electric field — the principle of induction. Move a magnet near a wire loop, or change a nearby current, and a current is induced. This is the basis of generators, which turn motion into electricity, and transformers, which change voltages. The induced current always flows so as to oppose the very change that made it (Lenz's law).
The big idea
A changing magnetic field makes electricity — that's how generators work.
Think about it
Push a magnet into a coil and you feel resistance. How is that the physical meaning of Lenz's law?
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