electromagnetism

In 1820, Hans Christian Oersted noticed a compass needle deflect near a current-carrying wire — accidentally unifying electricity and magnetism and launching the age of electromagnetism.

Michael Faraday's 1821 rotating wire became the device that now consumes 50% of the world's electricity. Here's how the electric motor works and why Tesla's AC design won.

Michael Faraday taught himself science while binding books and went on to discover electromagnetic induction. The story of the greatest self-taught scientist in history.

James Clerk Maxwell unified electricity, magnetism, and light into four equations, shot the first color photograph, and wrote thermodynamics poetry. His verified biography.

Light is both wave and particle. Explore photons, the electromagnetic spectrum, polarization, lasers, and quantum entanglement explained simply.

Maxwell unified electricity, magnetism, and light into one theory. His four equations revealed light as electromagnetic waves, predicting the entire spectrum.

Ampère discovered that electric currents create magnetic fields and developed the mathematical framework of electromagnetism. His laws still govern electrical engineering.

In 1831, Michael Faraday discovered that changing magnetic fields induce electric currents. This fundamental discovery enabled electric motors, generators, and transformed civilization.

Every interaction in the universe — from holding atoms together to making stars shine — comes down to four forces. Here's what they are, how they work, and why physicists are still hunting for a theory that unifies them.