a
Iron, steel and nickel
b
copper, steel and iron
c
lead, iron and brass
d
glass, lead and steel
e
stone, air and iron
Explanation
Correct Option
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Discussions (4)
Dave333
4 years ago
Magnetically hard materials are used to create permanent magnets made from alloys generally consisting of varying amounts of iron, aluminium, nickel, cobalt and rare earth elements samarium, dysprosium and neodymium.
Dave333
4 years ago
Magnetic materials are always made of metal, but not all metals are magnetic. Iron is magnetic, so any metal with iron in it will be attracted to a magnet. Steel contains iron, so a steel paperclip will be attracted to a magnet too. Most other metals, for example aluminium, copper and gold, are NOT magnetic.
