The magnet field lines due to a bar magnet are correctly shown in

Options

A.
B.
C.
D.

Answer

To determine which figure correctly depicts the magnetic field lines due to a bar magnet, we need to understand the characteristics of these field lines.

### Step-by-Step Solution:

1. **Understanding the Bar Magnet**:
- A bar magnet has two poles: a North Pole (N) and a South Pole (S). The magnetic field lines emerge from the North Pole and enter the South Pole.

2. **Direction of Magnetic Field Lines**:
- The magnetic field lines are directed outward from the North Pole and inward towards the South Pole. This means that the lines should start at the North Pole and end at the South Pole when viewed externally.

3. **Behavior Inside the Magnet**:
- Inside the bar magnet, the magnetic field lines run parallel to each other and from the South Pole to the North Pole. This indicates that the magnetic field is uniform inside the magnet.

4. **Analyzing the Options**:
- We need to look at each of the provided figures to see which one accurately represents the above characteristics.
- **Option A**: If the field lines come out from the North Pole and do not show any lines inside the magnet, this is incorrect.
- **Option B**: If the field lines come from the South Pole to the North Pole, this is also incorrect.
- **Option C**: Similar to Option B, if the lines are shown incorrectly, this is wrong.
- **Option D**: If the field lines come out from the North Pole, enter the South Pole, and show parallel lines inside the magnet, this option is correct.

5. **Conclusion**:
- After analyzing all the options, we find that **Option D** correctly depicts the magnetic field lines due to a bar magnet.

### Final Answer:
- The correct option is **D**.