A bar magnet is placed with its north pole towards geographic north. The neutral point

Options

A. Along the axis of the magnet
B. On the east-west line through the centre of the magnet
C. In only side of the magnet
D. In only west side of the magnet

Answer

To solve the problem of finding the neutral point when a bar magnet is placed with its north pole towards geographic north, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Setup**:
- A bar magnet is oriented such that its north pole points towards the geographic north.
- The Earth's magnetic field also has a north and south pole, which are not aligned with the geographic poles.

2. **Drawing the Earth and Magnetic Field**:
- Draw a simple representation of the Earth with the geographic north (GN) at the top and geographic south (GS) at the bottom.
- Indicate the magnetic north (MN) and magnetic south (MS) of the Earth, noting that the magnetic north is typically tilted relative to the geographic north.

3. **Direction of Magnetic Fields**:
- The magnetic field lines of the Earth emerge from the magnetic north and enter the magnetic south.
- The bar magnet will produce its own magnetic field, which also has a direction: from its north pole to its south pole.

4. **Identifying the Neutral Point**:
- The neutral point (or null point) is where the net magnetic field is zero. This occurs when the magnetic field due to the bar magnet cancels out the magnetic field of the Earth.
- For the bar magnet, the magnetic field direction will be from its north pole to its south pole.

5. **Analyzing the Position of the Neutral Point**:
- The neutral point will be located along the east-west line relative to the center of the bar magnet.
- At this point, the magnetic field due to the bar magnet will oppose the magnetic field of the Earth, resulting in a net magnetic field of zero.

6. **Conclusion**:
- Based on the analysis, the neutral point will be found on the east-west line to the center of the magnet, which is option B in the provided choices.

### Final Answer:
The neutral point is located on the east-west line to the center of the magnet.

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