Which of the following is false about magnetic field lines?

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The tangent to the field line at a given point represents the direction of the net magnetic field 'B' at that point.

Magnetic field lines start at the south pole and end at the north pole outside a bar magnet.

The larger the number of field lines crossing per unit area, the stronger the magnitude of the magnetic field 'B'.

The magnetic field lines do not intersect each other.

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.
Magnetic field lines never intersect each other.

Therefore,' Magnetic field lines start at the south pole and end at the north pole outside a bar magnet.' is a false statement.

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