Question

why magnetic field lines are closed curves?​

Answer 1

Explanation:

Magnetic field lines are closed curves as they propagate from the North pole outside the magnet's body to the magnet's body and from the south pole to the north pole inside the magnet's body. Hence, the magnetic field lines are closed.

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Answer 2

Magnetic field lines are closed curve because magnetic monopoles do not exit. Outside a magnet direction of magnetic field, lines are from north to the South Pole and inside a magnet the direction if from south to north, hence forming a closed loop.

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