GEOLOGY

Detailed explanation-1: -Cobalt, nickel, iron and steel are attracted by magnet and hence, they are magnetic in nature. Aluminium, copper and lead are non magnetic in nature.

Detailed explanation-2: -To take iron as an example, iron is one of the metals that is classed as magnetic, so any metal that contains iron will be magnetic too. That’s why steel, which contains iron, will be attracted to a magnet. Most other metals, for example aluminium, copper, and gold, are not magnetic.

Detailed explanation-3: -Iron nails, nickel, steel pen, and cobalt will be attracted to magnet and rest of the materials are non-magnetic in nature, so they will not be attracted to a magnet.

Detailed explanation-4: -Magnets can attract steel because steel is also a magnetic material made up of iron.

Detailed explanation-5: -Iron becomes a more intense magnet on magnetic induction. But that magnetic power is temporary. When the permanent magnet is removed it losses its magnetic power. In the presence of a magnet, steel doesn’t acquire the magnetic power like that of a soft iron.