First slide

Earth's Magnetism

Question

At a certain place, horizontal component of earth's magnetic field is $\sqrt{3}$ times the vertical component. The angle of dip at the plane is

Moderate

A

75^o
B

60^o
C

45^o
D

30^o

Solution

Angle of dip $ϕ$ is given by the relation
$\begin{array}{ll} V = Htan ϕ or ϕ = \tan^{- 1} (V / H) \\ ∴ ϕ = \tan^{- 1} (1 / \sqrt{3}) = 30^{\circ} \end{array}$

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