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Questions  >>  CBSE XII  >>  Physics  >>  Magnetism and matter
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Q)

The earth's core is known to contain iron. yet geologists do not regard this as a source of the earth mergnetisum . Why ?

$\begin{array}{1 1} \text{iron deposits less quantities } \\ \text{iron deposits are in the form of their compounds} \\ \text{iron deposits are in the molter state } \\ \text{none of the above} \end{array} $

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A)
Solution :
The earth's core contain iron but in the molten state .
The molten iron is not ferromagnetic material in nature.
Hence this cannot be treated as a source of earth's magnetism
Answer : $ \text{iron deposits are in the molter state } $
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