Which element is widely used to strengthen steel and is magnetic?

• A. Copper
• B. Nickel
• C. Iron
• D. Aluminum

Answer: (C)

Iron sits at the heart of steel and also brings magnetic properties. Steel is essentially iron alloyed with carbon and other elements to increase strength and hardness, so iron is the core metal involved in making steel strong. At room temperature, iron is ferromagnetic, meaning its magnetic domains can align to create a strong magnetic response. This combination—being the primary metal in steel and being magnetic—makes iron the best answer. Copper and aluminum aren’t magnetic, and while nickel can be used to tailor steel’s strength in some cases, iron is the common, foundational element that defines both steel and its magnetic character.