Poles of Magnet

Transcript

What happens when we bring Bar Magnet neat Iron Fillings ?More Iron fillings stick to sides of magnet Less iron fillings in the centre So, the Iron fillings stick more to sides of magnet instead of centre These sides are called Poles of Magnet What are Poles of Magnet ?Types of Poles North Pole South Pole Does only Bar Magnet have Poles ?No, All magnets have 2 poles - North Pole (N) and South Pole (S) How to find which pole is North and which Pole is South ?If we suspend a magnet, it always come to rest in North - South Position End pointing towards North Side is North Pole of Magnet End pointing towards South Side is South Pole of Magnet What happens if we break one pole of Magnet ?Unbroken Magnet North Pole South Pole Broken Magnet Even in small piece, there will be North and South Pole A magnet cannot exist with Single Pole Important Property of MagnetIt has Two poles - North Pole and South Pole If a magnet is suspended, it always come to rest in North and South Direction Why Magnets always point to North - South direction ?It mimics movement of earth Earth also behaves like a large magnet and is always in North South position South Pole North Pole It mimics movement of earth Earth also behaves like a large magnet and is always in North South position How is Magnet used to find Directions ?Magnetic compass is used to find directions Suspending Magnet is also used to find directions How to make Magnetic Needle Compass ? Take a cork piece, iron sewing needle, a permanent bar magnet, a bowl, and water Place the needle on a wooden table Rub one pole of the magnet along the needle in one direction only and repeat 30 - 40 times Bring iron filings or pins near the needle. If they get attracted, the needle has become a magnet Pass the needle through a cork horizontally and float the cork with the needle on water in a glass bowl When the cork stops moving, the needle will align itself in the north - south direction - your compass is ready What was Matsya Yantra ?This device was used in ancient times for finding directions at sea just like Magnetic Compass It consisted of a magnetised fish - shaped iron piece, kept in a vessel of oil. It also points towards North - South direction Matsya - Yantra Fish Device