Question

Which one is not a ferromagnetic material?

• A. cobalt
• B. tungsten
• C. nickel
• D. gadolinium
• E. iron

Hint:

Remember "FeCoNi" for the standard ferromagnetic trio.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
This is a knowledge-based question about the classification of materials based on their magnetic properties. Ferromagnetic materials are those that are strongly attracted to magnets and can be permanently magnetized.
Step 2: Detailed Explanation:
Let's analyze the options: - Iron (Fe): The most common and archetypal ferromagnetic material. - Cobalt (Co): A well-known ferromagnetic material. - Nickel (Ni): Another common ferromagnetic material. - Gadolinium (Gd): A rare-earth element that is ferromagnetic at temperatures below its Curie point of about 20 °C. It is a standard example of a ferromagnetic material besides Fe, Co, and Ni. - Tungsten (W): Tungsten is a paramagnetic material. Paramagnetic materials are weakly attracted to magnetic fields, but they do not retain any magnetism once the external field is removed. Therefore, tungsten is the material in the list that is not ferromagnetic.
Step 3: Final Answer:
Tungsten is not a ferromagnetic material.