Question
The angle of dip is the angle
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Answer
(c) The angle of dip is the angle between the direction of the earth's magnetic field and the plane of the horizon
Horizontal component of earth's magnetic field $=B_{H}=B \cos \theta$
Vertical component of earth's magnetic field $=B_{V}=B \sin \theta$
Now, $B \cos \theta=B \sin \theta$
$\Longrightarrow \theta=45^{\circ}$
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