Consider the plane S formed by the dipole axis and the axis of the earth. Let P be the point on the magnetic equator and in S. Let Q be the point of intersection of the geographical and magnetic equators. Obtain the declination and dip angles at P and Q.
Hint: The angle of dip is the angle made by the Earth's magnetic field with the horizontal plane.
Step 1: P is in the plane S, the needle is in the north, so the declination is zero.
Step 2: P is also on the magnetic equator, so the angle of dip = 0, because the value of the angle of dip at the equator is zero. Q is also on the magnetic equator, thus the angle of dip is zero.
As earth tilted on its axis by 11.3°, thus the declination at Q is 11.3°.