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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

`5 xx 10^(-6)` T northward

B

`5 xx 10^(-6)` T southward

C

`2.5 xx 10^(-7)` T northward

D

`2.5 xx 10^(-7)` T southward

Text Solution

Verified by Experts

The correct Answer is:
B
`B = (mu_0I)/(2pir)`
`=10^(-7)xx(2xx100)/4 `
`= 5 xx10^(-6)T` [southwards]
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