Electromagnetic theory is the study of electric and magnetic fields and how they interact — basically, Maxwell's equations ruling everything from motors to mobile signals. It's the absolute core of EE, so GATE loves it, but honestly, I find it too abstract sometimes. What makes it real for me is my father's old HMV gramophone; when I see the magnet and coil in that pickup, translating grooves into sound, *theory* suddenly has a warm, crackling voice.
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