How many of the following materials can be attracted by a magnet ? 1. Plastic 2. Carbon 3. Aluminium 4. Stainless Steel Select the correct answer using the code given below :

The correct answer is Option D (None) because none of the listed materials are typically attracted by a standard permanent magnet under normal conditions:

• Plastic: It is an organic polymer and a non-magnetic material.
• Carbon: Most forms of carbon (such as graphite and diamond) are diamagnetic, meaning they are actually weakly repelled by a magnetic field rather than attracted.
• Aluminium: It is a paramagnetic material. Its magnetic susceptibility is so low that its attraction to a magnet is nearly imperceptible and is classified as non-magnetic in general science contexts.
• Stainless Steel: While some grades (ferritic/martensitic) are magnetic, the most common types used in consumer goods (Austenitic stainless steels like 304 or 316) are non-magnetic due to their crystalline structure and high nickel/chromium content.

Since none of these materials exhibit significant magnetic attraction, the correct count is zero.