10. Electromagnetism

Electromagnetism explains the close relationship between electricity and magnetism. When an electric current flows through a conductor, it produces a magnetic field around it. By winding a wire around a soft iron core and passing electric current through it, we can create a temporary magnet called an electromagnet, which becomes magnetic only when current flows.

This principle is used in many important devices such as electric motors, electric bells, generators, and loudspeakers. Understanding electromagnetism helps students see how electrical energy can be converted into mechanical motion and useful work, making it a key concept behind many modern technologies used in homes, industries, and transportation systems. ⚡🧲