Class 8 Unit-8 (Electricity & Magnetism)
Unit-8 (Electricity and Magnetism) Magnet A magnet is a material that can attract certain metals, mainly iron, nickel, and cobalt . Magnets are widely used in daily life, such as in compasses, electric motors, speakers, and magnetic locks . Properties of a Magnet 1. A magnet attracts magnetic materials like iron, nickel, and cobalt. 2. A magnet repels or attracts other magnets depending on the poles. 3. Magnet has two poles: o North Pole (N): Points toward Earth's north. o South Pole (S): Points toward Earth's south. 4. Magnetic effects are strongest at the poles. 5. A magnet loses its magnetism if heated, hammered, or cut improperly. Types of Magnet: 1. Natural Magnets Definition: Magnets that are found naturally in the earth. Example: Lodestone . Characteristics: ü They are naturally magnetic without human intervention. ü Usually, they are irregular in shape. ü They can attract iron, cobalt, and...