the.com/electromagnetics

means The branch of physics and engineering that studies how electric charges and magnetic fields generate and influence each other, and how that interplay produces things like light, radio waves, and motors.

from Built from Greek 'elektron' (amber, the stuff ancient Greeks rubbed to raise a static charge) and 'magnetes,' tied to Magnesia, a region associated with naturally magnetic stones. The two words stayed strangers until the 19th century, when experiments showed a current could nudge a compass needle — electricity and magnetism were caught acting as one phenomenon. The compound word 'electromagnetic' was coined to name that unification, cementing in language what physics had just discovered in the lab.