The earth's magnetic field always has a vertical component except at the

Options

A. magnetic equator
B. magnetic poles
C. geographic north pole
D. latitude `45^(@)`

Answer

A

Explanation

Let `theta` be the angle of dip at a place. Then, `sin(theta) =B_(v)/B` and `cos(theta) = B_(H)/B`
At magnetic equator angle of dip becomes zero. So, the total magnetic field at the equator becomes a horizontal component (`B_H = B`) and the vertical component becomes zero `(B_(v) = 0)`