The magnetic field at a point on the magnetic equator is found to be `3.1 xx 10^(-5) T`. Taking the earth's radius to be 6400 km, calculate the magneitc moment of the assumed dipole at the earth's centre.

Explanation

To calculate the magnetic moment of the assumed dipole at the Earth's center, we can use the formula for the magnetic field \( B \) at the magnetic equator due to a magnetic dipole moment \( m \):

\[ B = \frac{\mu_0}{4\pi} \cdot \frac{2m}{r^3} \]

Where:
- \( B \) is the magnetic field at the equator,
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