Charges can be created or destroyed in …….. and ……….. Pairs only.

Explanation

To answer the question "Charges can be created or destroyed in …….. and ……….. pairs only," we need to understand the fundamental principles of charge conservation in electrostatics.

### Step-by-Step Solution:

1. **Understanding Charge Conservation**:
- According to the law of conservation of charge, charge cannot be created or destroyed in an isolated system. This means that the total charge before and after any interaction remains constant.

2. **Identifying Charge Types**:
- There are two types of electric charges: positive and negative. Positive charges repel each other, while negative charges repel each other as well. However, a positive charge will attract a negative charge.

3. **Exception to Charge Conservation**:
- The question hints at an exception where charges can be created or destroyed. This occurs during certain interactions, such as particle-antiparticle pair production.

4. **Defining the Pairs**:
- The pairs in which charges can be created or destroyed are specifically:
- **Positive and Negative pairs**: This means that for every positive charge created, a corresponding negative charge is also created, and vice versa.
- **Equal Magnitude**: The magnitudes of the positive and negative charges must be equal for this process to conserve the total charge.

5. **Final Answer**:
- Therefore, the complete answer to the question is: "Charges can be created or destroyed in **positive and negative** pairs only."