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Magnetism — PHYSICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9PHYSICSMagnetism2 Marks
Question
What is a lodestone?
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Answer

Lodestone is an ore of iron oxide $\left( Fe _3 O _4\right)$. This ore attracts small pieces of iron and it sets itself along a definite direction when it is suspended freely. It is a natural magnet which was used for the navigation by the mariners.

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