GEOLOGY

Detailed explanation-1: -If a glass plate is placed over a magnet and iron filings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate? How can a wire become magnetic? This type of material is repelled by a magnetic field.

Detailed explanation-2: -The iron fillings when sprinkled on a sheet of cardboard placed over a bar magnet take up a definite pattern(curved lines) when the cardboard is slightly tapped because every piece of the iron filling turns into a magnet due to the process of magnetic induction of the magnet.

Detailed explanation-3: -When iron filings are sprinkled on a sheet of glass placed over a short bar magnet then, the iron filings form a pattern suggesting that the magnet has two poles similar to the positive and negative charge of an electric dipole.

Detailed explanation-4: -When iron filings are sprinkled on a bar magnet, you see that these magnetic field lines start at the magnet’s north end and will end at the magnet’s south end. The field lines that curve toward each other show attraction. You will even see these curved lines if you sprinkle iron filings on two attracting bar magnets.

Detailed explanation-5: -Magnetic FIELDS a piece glass is placed over a bar magnet and the iron filings are then sprinkled on the surface the glass. The magnetizing force the magnet will be felt through the glass and each iron filing becomes a temporary magnet.