Write the number of magnetic materials in the following:
Iron, wood, plastic, cotton, paper, glass.

Explanation

To determine the number of magnetic materials from the given list (Iron, Wood, Plastic, Cotton, Paper, Glass), we will analyze each material to see if it is magnetic or non-magnetic.

### Step-by-Step Solution:

1. **Identify Magnetic Materials**:
- Magnetic materials are those that are attracted to magnets. Common examples include iron, cobalt, and nickel.

2. **Analyze Each Material**:
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