At a certain place, the angle of dip is \( 30^{\circ} \) and the horizontal component of earth's...

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At a certain place, the angle of dip is \( 30^{\circ} \) and the horizontal component of earth's magnetic field is \( 0.50 \) oersted. The earth's total magnetic field (in oersted) is:
(A) \( \frac{1}{2} \)
(B) \( \sqrt{3} \)
(C) \( \frac{1}{\sqrt{3}} \)
(D) 1
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