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Short answer type Question
Q. Define horizontal component of earth's magnetic field (H). Explain whether the value of H be the same everywhere on earth's surface?

Dear Student


The horizontal component of earth's magnetic field is the projection of earth's magnetic field on surface of the earth  

The total magnetic field on the surface of the earth can be resolved into horizontal component H_e and vertical component V_e. The angle made by B_e with H_e is the angle of dip δ and are related as

Hence,H_e =  B_e cos δ
As angle of dip is different at different place hence the value of horizontal component of earth;s magnetic field is different at different place.

Regards