This chapter introduces magnets and their special properties. Magnets attract certain materials such as iron, nickel, and cobalt, but do not attract wood, plastic, or aluminium. Every magnet has two poles—the North Pole and the South Pole—where the force of attraction is strongest. The chapter explains that like poles repel each other while unlike poles attract each other. A freely suspended magnet always aligns itself in the north–south direction, which is the principle used in a compass. Magnets can be natural like lodestone or artificial such as bar, horseshoe, and cylindrical magnets. They have many uses in daily life, including compasses, fridge doors, toys, cranes, motors, and speakers. The chapter also explains that magnets can lose their magnetic strength if heated, hammered, or dropped, and therefore must be stored properly with keepers to maintain their strength.
Key Points
Magnets attract materials like iron, nickel, and cobalt; they do not attract wood, plastic, or aluminium.
A magnet has two poles – North Pole (N) and South Pole (S).
Like poles repel each other (N–N, S–S), unlike poles attract each other (N–S).
Every magnet, if freely suspended, aligns itself in the north–south direction.
Magnets can be natural (lodestone) or artificial (bar, horse-shoe, cylindrical).
Uses of magnets: compass, fridge doors, toys, cranes (lifting heavy iron), motors, speakers.
Magnets lose their property if heated, hammered, or dropped hard.
Magnetism can pass through non-magnetic materials like paper, cloth, or wood.
Magnets are useful in daily life but should be stored properly with keepers (soft iron bars) to avoid losing strength.
👉 👉Magnets are powerful and useful in many ways. We should handle them carefully, store them properly, and use their properties for solving problems in daily life.