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Fill in the blank to complete the sentence :
The two ends of a magnet are called __________.
Fill in the blank to complete the sentence :
Unlike poles of a magnet ___________ each other.
'Induced magnetism is temporary'. Comment on this statement.
How do you account for the following fact?
Iron becomes magnetized when placed in a coil carrying direct current.
How do you account for the following fact?
Bar magnets lose their magnetism when heated strongly.
Describe various methods of magnetising a piece of iron.
A magnet is carefully broken into two halves along its long axis as shown in the figure. How would the magnetic strength of each piece compare with that of the original magnet?
A magnet is carefully broken into two equal pieces as shown in the figure. How would the magnetic field strength of each piece compare with that of the original magnet? 
Give scientific reason:
A ' cracking' noise may be heard on removing a nylon shirt, blouse, or stockings.
