why magnetic needle is used in magneti compass
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As the earth is a magnet the magnetic needle attracts the earth and thus tell the correct direction it always depends on earth magnetism.
Shreedipdas2005:
The Earth is a magnet that can interact with other magnets in this way, so the north end of a compass magnet is drawn to align with the Earth's magnetic field. Because the Earth's magnetic North Pole attracts the "north" ends of other magnets, it is technically the "South Pole" of our planet's magnetic field.
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this helps the sailors to locate north
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