Linked from
The 54 pages that link to Electromagnetism, each with the reason it gives.
Gauge symmetryBroader topic: Its potential admits local phase changes when the electromagnetic field transforms with it.
PhysicsBroader topic: It unifies electricity, magnetism, and light within one field theory.
Noether's second theoremBroader topic: Gauge invariance of its action entails a differential identity among its field equations.
History of physicsBroader topic: Its nineteenth-century unification connected laboratory phenomena with the nature of light.
Interactions and forcesBroader topic: It governs light, electricity, magnetism, and most interactions between atoms.
Outline of physical scienceBroader topic: It underlies electric power, motors, communications, and much modern instrumentation.
Physical phenomenaBroader topic: It explains light, electrical effects, magnetism, and many material interactions.