The magnetic moment of the assumed dipole at the earth’s centre is 8.0 × 10²² Am². Calculate the magnetic field B at the geomagnetic poles of the earth. Radius of the earth is 6400 km.

A magnetic dipole of magnetic moment 0.72 A m² is placed horizontally with the north pole pointing towards south. Find the position of the neutral point if the horizontal component of the earth’s magnetic field is 18 μT.

A magnetic dipole of magnetic moment 0.72√2 A m² is placed horizontally with the north pole pointing towards east. Find the position of the neutral point if the horizontal component of the earth’s magnetic field is 18 μT.

If the earth’s magnetic field has a magnitude 3.4 × 10^–5 T at the magnetic equator of the earth, what would be its value at the earth’s geomagnetic poles?

The magnetic field due to the earth has a horizontal component of 26 μT at a place where the dip is 60°. Find the vertical component and the magnitude of the field.