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

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

NTA AbhyasNTA Abhyas 2022

Solution:

Let $\theta $ be the angle of dip at a place.
Then,
$sin\left(\theta \right)=\frac{B_{V}}{B}$ and $cos\left(\theta \right)=\frac{B_{H}}{B}$
At magnetic equator angle of dip becomes zero.
So, the total magnetic field at the equator becomes a horizontal component $\left(B_{H} = B\right)$ and the vertical component becomes zero $\left(B_{V} = 0\right)$ .