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  4. At a certain place, the angle of dip is 30° and the horizontal component of earth's magnetic field is 0.50 oerested. The earth's total magnetic field (in oerested) is

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Q. At a certain place, the angle of dip is $30^{\circ}$ and the horizontal component of earth's magnetic field is $0.50$ oerested. The earth's total magnetic field (in oerested) is

Magnetism and Matter

Solution:

$B =\frac{ H }{\cos \theta}=\frac{0.50}{\cos 30^{\circ}}=\frac{0.50 \times 2}{\sqrt{3}}=1 / \sqrt{3}$