Which of the following is NOT ferromagnetic ?

Options

A. Cobalt
B. Iron
C. Maganese
D. Nickel

Answer

To determine which of the following materials is NOT ferromagnetic, we can follow these steps:

### Step 1: Understand Ferromagnetism
Ferromagnetism is a phenomenon where certain materials can become permanent magnets or are strongly attracted to magnetic fields. Common ferromagnetic materials include iron, cobalt, and nickel.

**Hint:** Remember that ferromagnetic materials retain their magnetism even after the external magnetic field is removed.

### Step 2: Identify Common Ferromagnetic Materials
The most well-known ferromagnetic materials are:
- Iron (Fe)
- Cobalt (Co)
- Nickel (Ni)

**Hint:** Think of everyday items that are magnetic; they often contain iron, cobalt, or nickel.

### Step 3: Evaluate the Given Options
In the question, we need to evaluate the options provided. Among the options, we need to identify which one is not a ferromagnetic material.

**Hint:** Look for materials that are not typically associated with strong magnetic properties.

### Step 4: Analyze Manganese
Manganese (Mn) is known to be a paramagnetic material. This means it does not retain magnetic properties in the absence of an external magnetic field. Therefore, it does not qualify as a ferromagnetic material.

**Hint:** Recall that paramagnetic materials are weakly attracted to magnetic fields and lose their magnetism when the field is removed.

### Step 5: Conclusion
Based on the analysis, the correct answer to the question "Which of the following is NOT ferromagnetic?" is manganese.

**Final Answer:** Manganese is NOT ferromagnetic.