Question

how does earth behave as a huge bar magnet

Answer 1

The North Pole of earth and South Pole of earth behaves as North and South poles of a bar magnet. Same as a bar magnet, magnetic lines also exist through poles of the Earth.

Answer 2

Our Earth behaves like a huge bar magnet. The south pole of this huge magnet lies close to the Earth's geographic North Pole and the North Pole of this magnet    lies close to the Earth's geographic South Pole.

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