[" Q.11A horizental overhead power line is ata height of "4" m from the ground and carries acurrent to "100Afrom],[" east to west.The magnetic fireld directly below it on the ground is "(mu_(0)-4 pi times10^(-7)TmA^(-1)" ) "],[[" (A) "2.5times10^(-7)T" southward "," (B) "5times10^(-6)T" northward "],[(C)5times10^(-6)T" southward "," (D) "2.5times10^(-7)" T northward "],[" passage : (Q.No."12" to "13" ) "," (D) "2.5times10^(-7)" T northward "],[" passage : (Q.No."12" to "13" ) "," plane of the paper as shown "]]