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[" 9.A horizontal overhead power line is...

[" 9.A horizontal overhead power line is at a height of "4m" for "],[" the ground and carries a current of "100A" from east to wan "],[" The magnetic field directly below it on the ground "],[(mu_(0)=4 pi times10^(-7)TmA^(-1)" ) [AIEE "2008;" Odisha JEE "2010" ] "],[[" (a) "5times10^(-6)" T northward (b) "5times10^(-6)T" southward "],[" (c) "2.5times10^(-7)" T northward (d) "2.5times10^(-7)" T southward "]]

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