$A$ horizontal overhead powerline is at a height of $4\,m$ from the ground and carries a current of $100\,A$ from east to west. The magnetic field directly below it on the ground is $\left( {{\mu _0} = 4\pi \times {{10}^{ - 7}}} \right)TmA^{-1}$.
- A$2.5 \times {10^{ - 7}}\,T$ southward
- B$5 \times {10^{ - 6}}\,T$ northward
- C$5 \times {10^{ - 6}}\,T$ southward
- D$2.5 \times {10^{ - 7}}\,T$ northward
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