A long rod \( \mathrm{R} \) made of soft iron is placed in vertical...

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A long rod \( \mathrm{R} \) made of soft iron is placed in vertical position. If a strong magnet \( N S \) is brought to the top of the rod as shown in Fig. , the rod gets - magnetised so intensely that it is able to hold at its other end several small pieces of iron. If the same magnet NS -is placed so as to stick to the rod at its side near the bottom, the magnetisation of the rod is too weak to hold the pieces of iron |
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