Choose the correct option and complete the given sentence.
The magnetic field lines outside the bar magnet _______________.

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random path

start from the north pole and end at the south pole

start from both the poles and end at infinity

start from the south pole and end at the north pole

answer is B.

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Detailed Solution

A magnetic field line is an imaginary line such that a tangent drawn to it at any point gives the direction of the magnetic field at that point in space.
The magnetic field lines start from the north pole and end on the south pole outside the magnet.
Inside the magnet, the magnetic field lines start from the south pole and end on the north pole.
The larger the number of magnetic field lines crossing per unit area, the stronger the magnitude of the magnetic field.