Then
He completed the unification of electricity and magnetism that Faraday had begun, and physicists raced to verify his waves.
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James Clerk Maxwell
1831 - 1879 · Scotland
James Clerk Maxwell united electricity and magnetism into four equations, predicting electromagnetic waves — and thereby radio, light theory and much of modern physics.
- Physics
- Industrial & Modern
Lived
1831 - 1879
Era
Industrial & Modern
Primary field
Physics
Signature idea
Unified electricity, magnetism, and light as electromagnetism
Their place in history
1831 - 1879
The question they asked
Is light itself a wave of electricity and magnetism moving through space?
The Contribution
What this scientist actually did — precisely and plainly.
His equations showed that changing electric and magnetic fields create each other and travel as waves at the speed of light, identifying light as an electromagnetic phenomenon.
How the Work Advanced Knowledge
The tools, experiments and reasoning behind the discovery.
He translated Faraday’s physical intuitions into mathematics, wrote down the field laws, and derived-testable predictions from them.
Why It Mattered Then / Today
From their own moment in history to the world we live in now.
Today
Wireless communication, radar, Wi-Fi, TV, satellites and superconductors all trace to Maxwell’s equations; Einstein kept them unchanged in relativity.
Important Works or Discoveries
Landmarks that carried the idea into the world.
- A Dynamical Theory of the Electromagnetic Field
- Maxwell’s equations
- Statistical studies of gases
Sources
Where this profile was verified.
Last reviewed: 2026-09-22
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