The earth's magnetic field can be considered as derived from a magnetic dipole in this task, the dipole is considered as located in the center of the earth and with a direction coinciding with the earth's axis of rotation. in a simple model of the plasma with a radius r= 2500 km in the equatorial plane currents in the interior of the earth, a current, i, runs in a circular path, the power is responsible for the magnetic dipole and thereby the earth's magnetic field. the magnetic dipole field is expressed using the dipole moment, m, in spherical coordinates: *т (2 cos0rsin0 0) в (r) 4.tt here 0 is the angle from the north pole. the earth's radius is considered a = 6370km. a) find the magnitude of the dipole moment, m, for the earth's magnetic dipole b) find the magnitude of the current, i, generating the dipole moment, m. c) find the magnitude and direction of the magnetic field b from the dipole over the equator height of h = 400 km over the equator