Question

Why ferromagnetic material is Sucking in Magnetic Fields? I want to know the fundumental principle behind this phenomenon.

Answer 1

Magnetic materials have magnetic dipoles at the atomic level. These dipoles have a north and south component. Strong magnetic fields occur in ferromagnetic materials when a large fraction of these dipoles align themselves. The direction is chosen based on it's affect on a positive charge. At the north pole, a positive charge moves away, in the south pole, a positive charge would move towards the pole. So it's not "sucking" in magnetic fields, its more like telling you the strength and direction of the field. You see this in gravity, the gravitational fields move away from an object, there is direction and strength -- nothing is "sucking" or "blowing" the gravitational field, but these ideas might help to visualize the vector fields.