Question

6. Give reasons:
a. Repulsion is the sure test for
magnetism
b. When a horseshoe magnet is dipped
in iron filings, no iron filings get
attached to the bent portion.
c. The casing of a magnetic compass is
usually made of aluminium.
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Answer 1

Answer:

a)This is because , Repulsion takes place only between two likes poles of a magnet whereas attraction takes place between two unlike poles of a magnet and also between a magnet and a magnetic material . ... So , repulsion is the sure test of magnetism .

b)when horseshoe magnet is dipped in iron filing, no iron filings get attached to bend portion. This is because the magnetic field is the strongest a the poles.

c)The casing of a magnetic compass is made of aluminium because aluminium is a non magnetic metal. Hence, it will not effect the working of compass as any other magnetic material, like iron will attract the magnetic needle and can cause the compass to show a wrong direction.

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