Physics – 4.1 Simple phenomena of magnetism | e-Consult

The iron needle will become magnetized and align itself with the bar magnet. It will rotate and eventually come to rest, pointing approximately along the direction of the bar magnet's magnetic field lines. This occurs because the bar magnet creates a magnetic field around it. This magnetic field exerts a force on the iron needle. The iron needle is ferromagnetic, meaning it can be easily magnetized. When the needle is near the magnet, the magnetic field lines from the magnet induce a magnetic field within the needle. The force on the needle is due to the interaction between the magnetic field of the magnet and the induced magnetic field in the needle. The direction of the force on the needle is along the direction of the magnetic field, causing the needle to align with the magnet.