Mark the correct statements:

Options

A. The nuclear force between two protons is always greater than the electronmagnetic force between them.
B. The electromagnetic force between two protons is always greater than the gravitatinal force between them.
C. The gravitational force between two protons may begreater than the nuclear force between them.
D. Electromagnetic force between two protons may be greater than ther nuclear force acting between them.

Answer

To solve the question of marking the correct statements regarding the forces acting between two protons, we will analyze each option based on our understanding of the fundamental forces: gravitational, electromagnetic, and nuclear forces.

### Step-by-Step Solution:

1. **Understanding the Forces**:
- **Gravitational Force**: This is the weakest force among the three and acts between any two masses.
- **Electromagnetic Force**: This force acts between charged particles and is significantly stronger than gravitational force.
- **Nuclear Force**: This is the strongest force, but it only operates effectively at very short ranges (less than \(10^{-14}\) meters).

2. **Analyzing Each Option**:
- **Option 1**: "Nuclear force between two protons is always greater than electromagnetic force between them."
- **Analysis**: This statement is **False**. The nuclear force is only stronger than the electromagnetic force when the distance between the protons is less than \(10^{-14}\) meters. At larger distances, the electromagnetic force can be greater.

- **Option 2**: "Electromagnetic force between two protons is always greater than gravitational force between them."
- **Analysis**: This statement is **True**. The electromagnetic force is indeed much stronger than the gravitational force, which is the weakest of all fundamental forces.

- **Option 3**: "Gravitational force between two protons may be greater than nuclear force between them."
- **Analysis**: This statement is **True**. If the distance between the protons exceeds \(10^{-14}\) meters, the nuclear force weakens significantly, and under such conditions, the gravitational force can become relatively significant, although still weak.

- **Option 4**: "Electromagnetic force between two protons may be greater than nuclear force acting between them."
- **Analysis**: This statement is **True**. Similar to option 3, when the distance is greater than \(10^{-14}\) meters, the electromagnetic force can be greater than the nuclear force.

3. **Final Conclusion**:
- The correct statements are: **Option 2, Option 3, and Option 4**.

### Summary of Correct Options:
- **Correct Statements**: Option 2, Option 3, and Option 4.