Which of the following alloys is used for making magnets?

Options

A. Duralumin
B. Stainless steel
C. Alnico
D. Magnalium

Explanation

To determine which alloy is used for making magnets, we can follow these steps:

### Step 1: Understand the question
The question asks us to identify which alloy among the given options is used for making magnets.

### Step 2: Analyze the options
We have four options to consider:
- A) Duralumin
- B) Stainless Steel
- C) Alnico
- D) Magnelium

### Step 3: Research the properties of each alloy
- **Duralumin**: This is an alloy of aluminum, copper, and other elements. It is primarily used in aircraft construction due to its lightweight and strength, but it is not known for magnetic properties.

- **Stainless Steel**: This is an alloy of iron, chromium, and sometimes nickel. While some stainless steels can be slightly magnetic, they are generally not used for making permanent magnets.

- **Alnico**: This is an alloy made from aluminum, nickel, and cobalt. Alnico is specifically known for its strong magnetic properties and high coercivity, which means it resists demagnetization. This makes it an excellent choice for making permanent magnets.

- **Magnelium**: This is an alloy of magnesium and aluminum. It is lightweight and used in various applications, but it does not have significant magnetic properties.

### Step 4: Identify the correct answer
Based on the analysis, Alnico is the alloy that is specifically used for making magnets due to its strong magnetic properties and high coercivity.

### Conclusion
The correct answer is **C) Alnico**.

---