Consider the plane S formed by the dipole axis and the axis of the earth. Let P be point on the magnetic equator 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.
P is in the plane of S, needle is in North, so the declination is zero.
P is also on the magnetic equator, so the angle of dip is zero, because the value of angle of dip at equator is zero. Q is also on the magnetic equator, so the angle of dip is zero.
As, the earth is tilted on its axis by 11.3°, thus the declination at Q is 11.3°.