Why are some iron objects magnetic and others. not magnetic?

Explanation

### Step-by-Step Solution

1. **Understanding Magnetic Properties**:
- Iron is a ferromagnetic material, which means it can become magnetized. However, not all iron objects are magnetic.

2. **What are Magnetic Domains?**:
- Inside iron, there are tiny regions called magnetic domains. Each domain acts like a small magnet with a north and south pole.

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