Question

Choose the correct statement(s) about the magnetic field lines around a bar magnet.

• A. Magnetic field lines around a bar magnet always make continuous closed loops.
• B. Magnetic field lines do not exist inside the magnet.
• C. Magnetic field lines always originates from the north pole of the magnet.
• D. Magnetic field lines always originates from the south pole of the magnet.

Answer 1

Answer: (A), (C)

Magnetic field lines always originates from the north pole of the magnet.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The magnetic field lines due to a bar magnet are closed continuous loops originating from the North pole and ending at the South pole of a bar magnet. Inside the magnet, the direction of field lines is from its South pole to its North pole. Thus the magnetic field lines are closed curves.
Since the magnetic field lines make close loops, we can conclude that they exist inside the magnet as well.