Which of the following is not attracted by magnet?

Correct option is D

Ans. (D) Brass

Sol.Brass is not attracted by a magnet because it is a non-magnetic alloy composed mainly of copper (Cu) and zinc (Zn). These elements are not ferromagnetic, meaning they do not generate their own magnetic field or get attracted to magnets.

On the other hand, steel, cobalt, and nickel are either ferromagnetic or contain ferromagnetic elements, making them strongly attracted to magnets.

Magnetic Properties of Other Options:

• Steel (Option A): Contains iron (Fe), which is ferromagnetic and strongly attracted to magnets.
• Cobalt (Option B): A ferromagnetic metal, used in making strong permanent magnets.
• Nickel (Option C): Also ferromagnetic, used in coins, batteries, and stainless steel.
• Brass (Option D): A non-magnetic alloy of copper and zinc, used in musical instruments, plumbing fittings, and decorative objects.

Information Booster:

• Ferromagnetic materials like iron, cobalt, and nickel exhibit strong magnetic properties.
• Paramagnetic materials (e.g., aluminum, platinum) are weakly attracted to magnets.
• Diamagnetic materials (e.g., brass, copper, gold, silver) are repelled by magnets.
• Steel is magnetic due to its iron content, but stainless steel can be non-magnetic depending on its composition.
• Cobalt and nickel are used in making permanent magnets.
• Brass does not contain iron, making it non-magnetic and useful in applications where magnetism is undesirable.