Page 1 :
MAGNETISM, Qn:, Ans:, , Differentiate between natural and artificial magnets., Magnets that are found in nature are called natural magnets., Man-made magnets are called artificial magnets., , Qn:, Ans:, , How can we find out the polarity of a magnet?, If a magnet is suspended freely, it will align in North-South direction. End, pointing northwards is north pole [N] and the end pointing southwards is the, south pole [S]., , Qn:, Ans:, , Name the property due to which a freely suspended magnet aligns in northsouth direction?, Directional property, , Qn:, Ans:, , How does a maglev train floats and moves over the rails?, Using attractive and repulsive properties of magnet., , Qn:, Ans:, , Mention magnetic properties?, Like poles repel, Unlike poles attract, , Qn:, , Identify the magnets.

Page 4 :
Let us assess:- Answers, 1., , C-North Pole, D . South pole, , 2.a, , A. fig 3, B. fig 2, , b., , Similar Poles repel each other; therefore, the pin diverges., In case of horse shoe magnet, the opposite poles attract each other therefore,, the pins converge inward., , 3.a., , b., , Wind insulated copper wire over a steel piece. Connect the free ends of the wire, to a battery. Current is passed through the coil for some time. When steel is, magnetized it become a permanent magnet. Once magnetised, it will remain as, magnet., Wind insulated copper wire over the soft iron piece, it becomes a strong magnet,, but it retains the properties of magnetism only as long as the current is passed, through the coil. As soon as the current is stopped it loses its magnetism. The, magnet formed by the passage of electric current, by using soft iron core is, called electromagnet. It is temporary in nature., , 4., , The ability of an object to pass magnetic force i.e. magnetic flux lines through it, is called Permeability. Iron has high permeability and hence it turn into magnet, when placed in contact with magnets., , 5., , Steel has high permeability. So, it absorbs magnetic lines of force.