Question

Earth's magnetic field always has a horizontal component except at :

• A. Magnetic equator
• B. Magnetic pole
• C. Geographical north pole
• D. At an altitude of 45${}^{\circ }$

Answer 1

The correct option is B Magnetic pole

Earth's magnetic field always has horizontal component expect at magnetic pole.

Horizontal component of earth magnetic field remains zero at magnetic pole.

It is because of the fact that at magnetic poles, the angle of dip is 90°.

Hence, the horizontal component ; $B_4=BCos\theta$ [$\theta =90°$]

$\Rightarrow$ $=BCos90°=0.$

OPTION : B.