A force between the two stationary charges separated by certain distance
(a) obeys Newton.s third law
(b) is a central force ( c) is non conservative force (d) is a scalar

Options

A. a is correct
B. a & b are correct
C. a & c are correct
D. c & d are correct

Answer

To solve the question regarding the nature of the force between two stationary charges, we will analyze each of the given statements one by one.

### Step-by-Step Solution:

1. **Statement (a): Obeys Newton's Third Law**
- According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. When two charges exert forces on each other, the force exerted by charge \( q_1 \) on charge \( q_2 \) (denoted as \( F_{12} \)) is equal in magnitude and opposite in direction to the force exerted by charge \( q_2 \) on charge \( q_1 \) (denoted as \( F_{21} \)). Therefore, this statement is **correct**.

2. **Statement (b): Is a Central Force**
- A central force is defined as a force that acts along the line joining the centers of two objects and depends only on the distance between them. The electrostatic force between two stationary charges is directed along the line connecting the two charges and depends on the distance between them (as described by Coulomb's law). Hence, this statement is also **correct**.

3. **Statement (c): Is a Non-Conservative Force**
- A non-conservative force is one where the work done depends on the path taken. However, the electrostatic force is a conservative force, meaning that the work done by the force is independent of the path taken and depends only on the initial and final positions. Therefore, this statement is **incorrect**.

4. **Statement (d): Is a Scalar**
- Forces are vector quantities, which means they have both magnitude and direction. The electrostatic force between two charges is also a vector quantity, as it has a specific direction along the line connecting the charges. Therefore, this statement is **incorrect**.

### Conclusion:
Based on the analysis:
- Statements (a) and (b) are correct.
- Statements (c) and (d) are incorrect.

Thus, the correct answer is that statements (a) and (b) are true.