A short bar magnet is placed with its north pole pointin north. The neutral point is `10 cm` away from the centre of the magnet. If `H=0.4G`, calculate the magnetic moment of the magnet.

Explanation

To solve the problem, we need to calculate the magnetic moment of the bar magnet using the given magnetic field strength (H) and the distance from the center of the magnet to the neutral point.

### Step-by-Step Solution:

1. **Understand the Formula**:
The magnetic field (H) at a distance (r) from the center of a short bar magnet is given by the formula:
\[
H = \frac{\mu_0}{4\pi} \cdot \frac{m}{r^3}
...