There are two magnets P and T, P is used as permanent magnet while T is used in transformers. Then correct options are

Options

A. P are high retentivity and low coercivity
B. P has low retentivity and high coercivity
C. T has low coercivity and low retentivity
D. T has high coercivity and high retentivity

Answer

To solve the question regarding the properties of magnets P and T, we need to analyze the characteristics of each magnet based on their usage.

### Step-by-Step Solution:

1. **Identify the Magnets**:
- Magnet P is a permanent magnet.
- Magnet T is used in transformers.

2. **Understand Permanent Magnet Properties**:
- Permanent magnets are made from hard ferromagnetic materials.
- They exhibit **high retentivity**, meaning they can retain a significant amount of magnetization even after the external magnetic field is removed.
- They also have **high coercivity**, which is the ability to withstand demagnetization.

3. **Analyze Magnet P**:
- Since P is a permanent magnet, it should have **high retentivity** and **high coercivity**.
- Therefore, any option stating that P has low retentivity or low coercivity is incorrect.

4. **Understand Transformer Magnet Properties**:
- Transformers typically use soft iron as the core material.
- Soft iron has **low retentivity**, meaning it does not retain magnetization well after the external magnetic field is removed.
- It also has **low coercivity**, which allows it to be magnetized and demagnetized easily.

5. **Analyze Magnet T**:
- Since T is used in transformers, it should have **low retentivity** and **low coercivity**.
- Any option stating that T has high retentivity or high coercivity is incorrect.

6. **Evaluate the Options**:
- Option 1: P has high retentivity and low coercivity - **Incorrect** (P has high retentivity and high coercivity).
- Option 2: P has low retentivity - **Incorrect** (P has high retentivity).
- Option 3: T has low retentivity and low coercivity - **Correct** (T is made of soft iron).
- Option 4: T has high coercivity and high retentivity - **Incorrect** (T has low retentivity and low coercivity).

### Conclusion:
The correct option is that T has low retentivity and low coercivity.

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