A horizontal overhead power line is at a...

A horizontal overhead power line is at a height of 4m from the ground and carries a current of 100 A from east to west. The magnetic field directly below it on the ground is `(mu_(0)=4pixx10^(-7)TmA^(-1))`

`2.5 xx 10^-7` T northword

`2.5 xx 10^-7 T southward`

`5.0 xx 10^-6` T northward

`5.0 xx 10^-6` T southward

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