Define magnetic field of earth?
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Earth's magnetic field is a magnetic dipole, similar to that of a bar magnet tilted 11° from the earth's axis of rotation. The magnetic south pole is near the geographic south pole, and the magnetic north pole is near the geographic north pole.
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The earth itself behaves as a magnet which causes a freely suspended magnet ( or magnetic needle) to point always in a particular direction: north and south. The shape of the Earth's magnetic field resembles that an imaginary bar magnet a length one - fifth of Earth's diameter buried at it's centre.
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