W what is magnetic compass ?
explain it construction and working
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A magnetic compass is a simple device used for finding direction. It consists of a magnetic needle that can turn freely about its centre. The needle is encased in a box with a transparent top. Directions are either printed on a card placed below the needle or marked on top of the box. Usually, the north pole of the needle is painted red or blue, or is in the shape of an arrowhead. When kept away from magnetic materials, the north pole of the needle points towards the geographical north. To find directions, the box is turned till the north mark on the card falls exactly below the north pole of the needle. In this position, the other directions are also indicated by the card.
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