Magnetism Online Test 6th Science Lesson 13 Questions in English

About 2500 years ago magnetic rocks were found in a place called Magnesia. Those rocks were attracted to iron materials. More of these rocks were found worldwide.

The magnetic rocks found naturally are called as magnets. The ore is called as magnetite which was named after the boy Magnus and the place Magnesia where it was found.

Magnetite was the ore with the attracting property and it is called as Natural Magnets. These are also called as Natural Magnets, Leading Stones, and lode stones.

Bar-magnet, Horseshoe magnet, Ring magnet and Needle magnet are generally used artificial magnets.

Natural magnets or magnetite are the ore with attracting property. These do not have a defined shape and it is mainly used for finding the directions.

The Method of converting the iron piece into magnet artificially is called as Magnetization. Magnets of these types are called as Artificial Magnets.

Substances which are not attracted by magnet are called non-magnetic substances. Paper, plastic are called non-magnetic substances.

Magnetic substances are attracted by Magnets (Iron, Cobalt, and Nickel). A Non-magnetic substance is not attracted by magnets (Paper, plastic). Artificial Magnets are available in various form and shapes like Horse shoe, Needle, Ring, Oval, Bar, Disc. Natural magnets are also called as Lead stones and Lode stones.

The Attractive forces of the magnets are very large near the two ends of the magnet which are called as poles.

The Magnets comes to rest position roughly in North-South direction when it is suspended freely. The end points are called as North and South Poles.

Around 800 years ago, the Chinese discovered the directive property of magnets. They used load stones in their boats to find directions during storm and mist.

A Compass is an instrument which is used to find directions in ships and airplanes. It has a magnetic needle that can rotate easily. The marked end of the needle denotes the north pole of the magnet.

A compass is an instrument which is used to find directions. It is mostly used in ships and airplanes. As a rule, mountaineers also carry a compass with them so that they do not lose their way in unknown places.

The Opposite poles of different magnets attract each other similarly the same poles repel each other. These properties are called as Attraction and Repulsion nature of magnets.

Magnets lose their properties if they are heated, hammered, Dropped from heights and placed near the cellphone, Computer.

Proper storage of magnets is also needed to preserve their properties. Soft iron should be placed across their ends.

Magnets are used in various equipment’s in day to day life. Speakers, Toys, bags, Compass, Magnetic crane, Medical field, Stickers and Door Locks.

Maglev is Magnetic Levitation which uses the property of magnetic attraction and repulsion to run these super-fast electromagnetic trains.

Many of the countries are trying to use the Maglev train for public transport. Mainly China, Japan, South Korea currently using this train for transports.

Electromagnetic train works under the concept of the levitation of magnets. It does not require petrol or diesel. This Electromagnetic train also called as Suspension train or Flying train.2

The Electro magnets used in the electromagnetic trains are magnetized by the current flown through that. When the direction of this current flow is changed the poles are also changed.

The Magnets of the electromagnetic train are controlled by the current passing through it. These magnets are attached on sides of the track and in the bottom sideway of the train. As there are no moving parts there is no friction so the train can attain high speed than other techniques.

Electromagnetic trains are known for their high speed because of No friction and it is also produce less noise and it is Eco friendly. It requires very less energy for its operation.

The Magnets are used for finding the direction. The unlike poles of any two different magnets attract each other and the same poles attracted towards each other. Using these principles electromagnetic train is operated.

Wood is not attracted to magnets and it is not a magnetic material. All other materials listed above have the tendency to attract towards magnet.

Magnets lose their properties when they are placed near Cellphone, Computer, DVDs. These objects will also get affected by magnetic field.

Improper storage can also cause magnets to lose their properties. To keep them safe, bar magnets should be kept in pairs with their unlike poles on the same side. They must be separated by a piece of wood and two pieces of soft iron should be placed across their ends. Magnets lose their properties if they are heated or dropped from a height or hit with a hammer.