A short bar magnet is placed in the magnetic meridian with its north pole pointing towards geographical south. A neutral point is found at a distance of 30 cm from the centre of the magnet. If the horizontal component of earth's field is 0.4G , calculate the magnetic moment of the magnet .

Explanation

To solve the problem, we need to find the magnetic moment of a short bar magnet based on the given parameters. Here's a step-by-step solution:

### Step 1: Understand the Given Data
We have the following information:
- Distance of the neutral point from the center of the magnet, \( R = 30 \, \text{cm} = 0.3 \, \text{m} \)
- Horizontal component of Earth's magnetic field, \( B_H = 0.4 \, \text{G} = 0.4 \times 10^{-4} \, \text{T} \)

### Step 2: Identify the Relevant Formula
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