A permanet magnet

Options

A. attracts all substance
B. attracts only magnetic substance
C. attracts magnetic substance and repels all non-magnetic substances
D. attracts non-magnetic substances and repels magnetic substances

Explanation

To solve the question about the characteristics of a permanent magnet, we will analyze the options provided based on the properties of permanent magnets.

### Step-by-Step Solution:

1. **Understanding Permanent Magnets**:
- A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field.
- Permanent magnets have two poles: a north pole and a south pole.

2. **Magnetic Attraction**:
- Permanent magnets attract only magnetic substances. These include ferromagnetic materials like iron, cobalt, and nickel.
- They do not attract non-magnetic substances, such as wood, plastic, or glass.

3. **Analyzing the Options**:
- **Option 1**: "Attracts only all substances" - This is incorrect because permanent magnets do not attract all substances; they only attract magnetic materials.
- **Option 2**: "Attracts only magnetic substances" - This is partially correct but does not mention the repulsion of non-magnetic substances.
- **Option 3**: "Attracts magnetic substances and repels all non-magnetic substances" - This is correct as it accurately describes the behavior of permanent magnets.
- **Option 4**: "Attracts non-magnetic substances and repels magnetic substances" - This is incorrect because permanent magnets do not attract non-magnetic substances.

4. **Conclusion**:
- The correct answer is **Option 3**: "Attracts magnetic substances and repels all non-magnetic substances".