The branch of physics that studies how electric currents, electric fields, and magnetic fields interact to create forces and energy.
From electro- + dynamics. The field became formalized in the 19th century when Maxwell unified electricity, magnetism, and light into one mathematical framework, creating modern electromagnetism.
Electrodynamics explains why a compass needle points north (Earth's magnetism), how generators create electricity from motion, and how radio waves travel through space—it's the physics that powered the modern world.
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