Which of the following figures represents the magnetic lines of force due to an isolated north pole?

Options

A.
B.
C.
D.

Explanation

To determine which figure represents the magnetic lines of force due to an isolated north pole, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Magnetic Lines of Force**:
- Magnetic lines of force are imaginary lines that represent the direction and strength of a magnetic field. They emerge from the north pole of a magnet and enter the south pole.

2. **Behavior of an Isolated North Pole**:
- An isolated north pole will have magnetic lines of force that radiate outward from it. This means that the lines should be shown as emanating from the north pole in the figures.

3. **Analyzing the Options**:
- **Option 1**: If all the magnetic lines of force are shown going outward from a point, this represents the behavior of an isolated north pole. This option is correct.
- **Option 2**: If all the magnetic lines of force are going inward, this indicates an isolated south pole. Therefore, this option is incorrect.
- **Option 3**: If the lines of force are entering in one region and exiting in another, this does not represent an isolated north pole. This option is incorrect.
- **Option 4**: Similar to option 3, if the lines of force are entering in one half and exiting in another half, this does not represent the behavior of an isolated north pole. This option is also incorrect.

4. **Conclusion**:
- The only option that correctly represents the magnetic lines of force due to an isolated north pole is **Option 1**, where all lines are going outward.

### Final Answer:
The figure that represents the magnetic lines of force due to an isolated north pole is **Option 1**.