Pls give the answer fast..
Dear student,
Because the iron filings become magnets themselves.
Each atom in a piece of iron is a magnet, with a north pole and a south pole. Most pieces of iron are not magnetic, because the atomic magnets all point in different directions. When you bring a magnet near a piece of iron, the iron-atom magnets line up with the applied magnetic field: The north poles of the iron atoms all point in the same direction. Because the iron atoms line up, the piece of iron becomes a magnet and is attracted to the original magnet. In a rod-shaped piece of iron, the atoms will tend to line up so that all the north poles face one end of the rod and all the south poles face the other end. Since iron filings are rod-shaped, the atoms line up pointing along the length of the rod, and the rods line up parallel to the direction of the applied magnetic field.
If you have sufficiently large iron filings, the shape will look like the figure shown below with no empty space.
Regards.
Because the iron filings become magnets themselves.
Each atom in a piece of iron is a magnet, with a north pole and a south pole. Most pieces of iron are not magnetic, because the atomic magnets all point in different directions. When you bring a magnet near a piece of iron, the iron-atom magnets line up with the applied magnetic field: The north poles of the iron atoms all point in the same direction. Because the iron atoms line up, the piece of iron becomes a magnet and is attracted to the original magnet. In a rod-shaped piece of iron, the atoms will tend to line up so that all the north poles face one end of the rod and all the south poles face the other end. Since iron filings are rod-shaped, the atoms line up pointing along the length of the rod, and the rods line up parallel to the direction of the applied magnetic field.
If you have sufficiently large iron filings, the shape will look like the figure shown below with no empty space.
Regards.