The magnetic field of earth at the equator is approximately `4xx10^(-5)T`. The radius of earth is `6.4xx10^(6)m`. Then the dipole moment (in `A-m^(2)`) of the earth will be nearly of the order of

Explanation

To find the dipole moment of the Earth using the given magnetic field at the equator and the radius of the Earth, we can use the formula for the magnetic field \( B \) due to a magnetic dipole moment \( m \):

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

Where:
- \( B \) is the magnetic field (in tesla),
...