Question

At a place, the horizontal component of earth’s magnetic field is B and angle of dip is 60°. What is the value of horizontal component of the earth’s magnetic field at equator.

Answer 1

Here, BH = B and δ = 60° 

We know that 

B_H = B_E cos δ 

B = B_E cos 60° 

⇒ B_E = 2B

At equator δ = 0° 

∴ B_H = 2B cos 0° = 2B