(iv) In olden days, sailors used to find direction by suspending a piece of ____.
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During the olden days, when the compass was not developed to find direction, the sailors used to find the direction using a bar magnet. They used to suspend it freely with the help of a thread and find the direction when they travel.
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a bar magnet
In olden days, sailors used to find direction by suspending a piece of a bar magnet.
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