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A horizontal overhead power line is at a height of \( 4 \mathrm{~m} \) from the ground and carries a current of 100 A from east to west. The magnetic field directly below it on the ground is \( \left(\mu_{0}=4 \pi \times 10^{-7} \mathrm{~T} \mathrm{~m} \mathrm{~A}^{-1}\right) \)
(A) \( 2.5 \times 10^{-7} \) T southward
(B) \( 5 \times 10^{-6} \) T northward
\( \mathrm{P} \)
(C) \( 5 \times 10^{-6} \) T southward
(D) \( 2.5 \times 10^{-7} \) T northward
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