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The value of the horizontal component of the earth's magnetic field and angle of dip are \( 1.8 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^{2} \) and \( 30^{\circ} \), respectively, at some place. The total intensity of earth's magnetic field at that place will be
(A) \( 2.08 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^{2} \)
(B) \( 3.18 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^{2} \)
(C) \( 3.67 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^{2} \)
(D) \( 5.0 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^{2} \)
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