what is a magnetic needle and why do we use a magnetic compass ? Why do we need it?
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it a needle fixed in a compass , as earths magnetic field attracts these ends we are able to get the direction
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The Magnetic Compass
Overview
The magnetic compass was an important advance in navigation because it allowed mariners to determine their direction even if clouds obscured their usual astronomical cues such as the North Star. It uses a magnetic needle that can turn freely so that it always points to the north pole of the Earth's magnetic field. Knowing where north is allows the other directions to be determined as well. The compass was invented by the Chinese, and was widely used for navigation beginning in about the thirteenth century
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