Consider the given statements:
(A) Electric field lines form always a closed loop
(B) A dipole do not exert any electric flux
(C) Coulomb's law follow the Newton's third law
Which of the above sentences are correct

Options

A. (A), (B)
B. (B) and (C)
C. only (B)
D. only (C)

Explanation

To solve the question, we need to analyze each of the given statements one by one.

### Step 1: Analyze Statement (A)
**Statement (A):** Electric field lines form always a closed loop.

- **Explanation:** Electric field lines do not form closed loops. They begin at positive charges and end at negative charges. In the case of isolated charges, they extend infinitely in space. Therefore, this statement is **incorrect**.

### Step 2: Analyze Statement (B)
**Statement (B):** A dipole does not exert any electric flux.

- **Explanation:** A dipole consists of two equal and opposite charges separated by a distance. When we consider a Gaussian surface surrounding a dipole, the total electric flux through that surface is zero because the electric field lines that enter the surface from one charge exit through the other charge. Hence, this statement is **correct**.

### Step 3: Analyze Statement (C)
**Statement (C):** Coulomb's law follows Newton's third law.

- **Explanation:** Coulomb's law states that the force between two point charges is equal in magnitude and opposite in direction. This is consistent with Newton's third law, which states that for every action, there is an equal and opposite reaction. Therefore, this statement is **correct**.

### Conclusion
Based on the analysis:
- Statement (A) is **incorrect**.
- Statement (B) is **correct**.
- Statement (C) is **correct**.

Thus, the correct statements are **(B) and (C)**.

### Final Answer
The correct sentences are (B) and (C).

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