Consider the following statements about magnetic field due to a bar magnet:

(a) The field lines inside a bar magnet are directed from its south pole to the north pole.

(b) The magnetic field lines exist only outside the bar magnet.

Which of the above statements is/are correct?

Correct option is A

Sol:The correct answer is (a) only (a)

Key Points:

Magnetic Field Lines:

• Magnetic field lines are closed loops. They emerge from the north pole of the bar magnet, curve around in space, and re-enter the magnet at the south pole.
• Inside the bar magnet, the field lines travel from the south pole to the north pole, completing the loop.

Magnetic Field Exists Everywhere:

• The magnetic field lines exist both inside and outside the bar magnet. They are continuous and do not start or end in space.

Pole Convention:

• The north pole of a bar magnet is the region where magnetic field lines emerge, and the south pole is where they converge.

Direction of Field Lines:

• Outside the magnet: Field lines go from the north pole to the south pole.
• Inside the magnet: Field lines travel from the south pole to the north pole.

Density of Field Lines:

• The strength of the magnetic field is represented by the density of the field lines. It is strongest near the poles where the lines are most concentrated.