The correct relation is where BH = Horizontal component of earth's magnetic feild; BV = vertical component of earth's magnetic feild and B = Total intensity of earth's magnetic feild.
As we have learnt,
Horizontal component of earth's magnetic field at any other Place -
Total intensity can be resolved into horizontal component (BH) and vertical component (Bv)
-
Angle between BH & BV is 90o.
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