Science [2 Mark Questions]

Hematite (69% of Iron), Magnetite (72.4% of Iron) and Side-rite (48.2% of Iron). Magnetite is an oxide ore of iron with the formula Fe 304. Among these ores, Magnetite has more magnetic property.

Bar magnets, U-shaped magnets, horseshoe magnets, cylindrical magnets, disc magnets, ring magnets and electromagnets are some examples of artificial magnets.

Repulsive:

1. Attractive property a magnet always attracts materials like iron, cobalt and nickel
2. Property another property of a magnet that like poles repel each other i.e., a north pole repels another north pole and a south pole repels another south pole.
3. Directive property the property of a magnet, by which it aligns itself along the geographic north-south direction, when it is freely suspended, is known as the directive property of a magnet.

The most powerful magnet in the Universe is actually a neutron star called Magnetar:

1. Located in the Milky Way Galaxy.
2. The diameter of the magnetar is 20 kilometer and its mass is 2 to 3 times than that of the Sun.
3. Its magnetic field is so enormous and lethal that it is capable of absorbing all the iron atoms from the bloodstream (hemoglobin) of a living body even if it is positioned at a distance of 1000 km from it.

Each broken piece behaves like a separate magnet. Therefore, four pieces will have eight poles.
Conclusion:
Thus, we can conclude that unlike poles of a magnet attract each other, i.e., the north pole and the south pole of a magnet attract each other.

Magnets that are made by people in a laboratory or a factory are called artificial magnets.
Example:
Horseshoe magnet, a bar magnet, a U-shaped magnet, cylindrical magnets, disc magnets, ring magnets, and electromagnets.