GEOLOGY

Detailed explanation-1: -These include iron, nickel, cobalt, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone.

Detailed explanation-2: -Iron is an extremely well-known ferromagnetic metal. It is, in fact, the strongest ferromagnetic metal. It forms an integral part of the earth’s core and imparts its magnetic properties to our planet. That is why the Earth acts as a permanent magnet on its own.

Detailed explanation-3: -Magnets are made of a group of metals called ferromagnetic metals. Nickel and iron are examples of these metals. Metals such as these are unique in their ability to be magnetized uniformly.

Detailed explanation-4: -The bar magnet is moved along the length of the iron strip. Thus, the bar magnet is lifted from the other end and brought to the starting point again with the same pole of the bar magnet its moved back. On repeating the process for at least 40 to 50 times, the iron strip will become a bar magnet with two poles.