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Ch 13 fun with magnets
- 1. Ch-13 Fun With Magnets MADE BY HETANSHEE PATEL Hetanshee Education Series
- 2. How were magnets discovered? 2 Hetanshee Education Series
- 3. Different types of magnets 3 U-Shape Magnet Bar Magnet Button Magnet Cylindrical Magnet Horseshoe Magnet Hetanshee Education Series
- 4. What is a Magnet? The substances having property of attracting magnetic materials like iron are now known as Magnets. The two types of Magnets are : - 1. Natural Magnets 2. Artificial Magnets 4 Hetanshee Education Series
- 5. Natural Magnets Natural occurring minerals or ores having magnetic properties is called Natural magnets. Due to their irregular shape and weak attracting power, natural magnets are rarely used now a days. For Example :- Magnetite , Loadstone 5 Hetanshee Education Series
- 6. Artificial Magnets Now a days pieces of iron and many other materials of many different shapes and sizes are used as magnets they are called Artificial Magnets. 6 Hetanshee Education Series
- 7. Uses of Magnets There are many uses of the magnets :- 1. It is used in compass to find directions. 2. It is used in factories for lifting heavy masses of iron. 3. It is used by surgeons in hospitals to remove steel splinters from the wounds. 4. It used in construction of telephones, electric cells etc. 5. It is used to separate iron from steel from non-magnetic materials. 7 Hetanshee Education Series
- 8. Properties of Magnets A magnet have many properties :- 1. It can attract magnetic materials. Its attracting power is maximum at poles and minimum at the middle ( neutral region ). 2. When a magnet is suspended freely it aligns itself in North – South direction only. 3. The magnets have 2 poles which are equal in strength and opposite in nature( They are like dipole ). 4. Like poles repel , Unlike poles attract each other. 8 Hetanshee Education Series
- 10. Magnetic Materials The materials which get attracted towards a magnet are called Magnetic Materials. For example: - Iron, Nickel and Cobalt 10 Hetanshee Education Series
- 11. Non-Magnetic Materials The materials which don’t get attracted by magnets are called Non-magnetic materials. Most things used in our daily lives are non-magnetic materials For Example : - Aluminum, Copper, Silver, Gold, Rubber, etc. 11 Hetanshee Education Series
- 12. Magnetism Magnetism is the force exerted by magnets when they attract or repel each other. It is the force that attract the magnetic materials. 12 Hetanshee Education Series
- 13. Magnetic Field The area surrounding the magnet in which magnetic force is exerted to attract iron is known as Magnetic field. The magnetic lines of force originate from the North Poleofa magnet and end at its SouthPole. 13 Hetanshee Education Series
- 14. Magnetic Poles The parts of the Magnet where the magnetic force is strongest is called Magnetic poles. All magnets have 2 poles :- North Pole and South Pole 14 Hetanshee Education Series
- 15. Safety Measures for Magnets Magnets loose their properties if they are heated, hammered or dropped from some height. Magnets become weak if they are not stored properly. Magnets tend to become weaker after some time if their poles are left free. This are called Self-Demagnetization. To avoid this bar magnets are kept in pairs separated by wood with unlike poles on the same side. Soft pieces of iron called Magnetic Keepers are placed on both the ends. A Horseshoe magnet need only one keeper across its poles. 15 Hetanshee Education Series