The earth is considered as a short magnet with its centre coinciding with the geometric centre of earth. The angle of dip related to the magnetic latitude as

Step-by-step solution

For a dipole at position ( R , Q ) B _ R = ₀ 4 2 M R ³ ...(i) and B _ Q = ₀ 4 M R ³ ...(ii) Also = B _ V B _ H =- B _ R B _ Q ...(iii) Dividing eq. (i) by (ii) B _ R B _ Q = 2 =2 From eq. (iii) and (iv) =-2 From figure, =90^ + =-2 (90+ ) =2