Explanation:


Magnetism is a phenomenon in which certain materials exhibit an attractive or repulsive force. There are two types of magnets, natural magnets and artificial magnets. Natural magnets are naturally occurring materials that exhibit magnetism, while artificial magnets are materials that are magnetized through external means, such as exposure to a magnetic field or electric current.

Natural Magnet:


Magnetite is a natural magnet. It is an iron oxide mineral that is found in igneous, metamorphic, and sedimentary rocks. Magnetite is a naturally occurring material that exhibits magnetism. It is the most magnetic of all the naturally occurring minerals on Earth. Magnetite is black or brownish-black in color, with a metallic luster and a hardness of 5.5-6.5 on the Mohs scale.

Artificial Magnets:


Artificial magnets are materials that are magnetized through external means. Some examples of artificial magnets include:

- Bar magnets: a rectangular or cylindrical magnet with north and south poles at opposite ends
- Horseshoe magnets: a U-shaped magnet with north and south poles at opposite ends
- Electromagnets: a magnet created by passing an electric current through a coil of wire

Conclusion:


In conclusion, Magnetite is a naturally occurring material that exhibits magnetism and is therefore a natural magnet. The other options, magnetic needle, bar magnet, and horseshoe magnet are all examples of artificial magnets.