Physics Uncovered on Instagram: "This is electromagnetism — one of the four fundamental forces of the universe. 🌌 When electric current flows through a wire, it creates a magnetic field around it. Wrap that wire into a coil, and the field strengthens — turning electricity into magnetism. Add an iron core inside, and you get an electromagnet powerful enough to lift cars or move train tracks. That same principle powers everything from your phone’s speakers and motors to MRI machines and maglev tr