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JEE Main 2022 (29 Jun, Shift 1) · Earth's Magnetism

Earth's Magnetism question from JEE Main 2022 (29 Jun, Shift 1)

Q2JEE Main 2022 · 29 JUN · SHIFT 1Easy

Earth's Magnetism

At a certain place the angle of dip is 30 $^\circ$ and the horizontal component of earth's magnetic field is 0.5 G. The earth's total magnetic field (in G), at that certain place, is:

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Answer: (a)

$H = B_E\cos\delta \Rightarrow B_E = \frac{H}{\cos 30^\circ}$
$B_E = \frac{0.5}{\sqrt{3}/2} = \frac{1}{\sqrt{3}}\ \text{G}$
So the answer is (a) $\frac{1}{\sqrt{3}}$ .

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