Which of the following statement is not a similarity between electrostaic and gravitational forces?

Options

A. Both forces obey inverse square law.
B. Both forces operate over very large distances.
C. Both forces are conservative in nature.
D. Both forces are attractive in nature always.

Explanation

To determine which statement is not a similarity between electrostatic and gravitational forces, we can analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Nature of Forces**:
- **Electrostatic Force**: This force can be both attractive and repulsive. It depends on the nature of the charges involved (like charges repel, unlike charges attract).
- **Gravitational Force**: This force is always attractive. It acts between masses and pulls them together.

2. **Evaluate the First Option**:
- **Inverse Square Law**: Both electrostatic and gravitational forces follow the inverse square law. The force is inversely proportional to the square of the distance between the two charges or masses.
- **Conclusion**: This is a similarity.

3. **Evaluate the Second Option**:
- **Long Range Force**: Both forces act over long distances. The strength of both forces decreases with distance, but they can still exert influence over large separations.
- **Conclusion**: This is a similarity.

4. **Evaluate the Third Option**:
- **Conservative Nature**: Both electrostatic and gravitational forces are conservative forces. This means that the work done by these forces in moving an object between two points is independent of the path taken.
- **Conclusion**: This is a similarity.

5. **Evaluate the Fourth Option**:
- **Attractive Nature**: This statement claims that both forces are always attractive. As established earlier, while gravitational force is always attractive, electrostatic force can be either attractive or repulsive depending on the charges involved.
- **Conclusion**: This is NOT a similarity.

### Final Answer:
The statement that is not a similarity between electrostatic and gravitational forces is: **"Both forces are attractive in nature always."**