The earth's magnetic field at the equator is approximately `0*4G`, Estimate the earth's dipole moment.

Explanation

To estimate the Earth's dipole moment given that the Earth's magnetic field at the equator is approximately 0.4 Gauss, we can follow these steps:

### Step 1: Convert the Magnetic Field from Gauss to Tesla
The magnetic field \( B \) at the equator is given as 0.4 Gauss. We need to convert this value into Tesla since the standard unit of magnetic field in the SI system is Tesla.

\[ 1 \text{ Gauss} = 10^{-4} \text{ Tesla} \]
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