At certain place, the angle of dip is \( 60^{\circ} \) and the horizontal component of earths ma...

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At certain place, the angle of dip is \( 60^{\circ} \) and the horizontal component of earths magnetic field is 0.5 oersted. The earths total magnetic field (in oersted) is
(a) \( \frac{1}{\sqrt{3}} \)
(b) \( \frac{1}{2} \)
(c) 1
(d) \( \sqrt{3} \)
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