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A horizontal overheadpowerline is at hei...

A horizontal overheadpowerline is at 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
`( nu_(0) = 4 pi xx 10^(-7) Tm A^(-1)`

A

`5xx10^(-6)T` northward

B

`5xx10^(-6)T` southward

C

`2.5xx10^(-7)T` northward

D

`2.5xx10^(-7)T` southward

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