A horizontal overhead powerline 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 one the ground is(un = 470 x 10-TmA=!) (1) 2.5 x 10-7 T southward (2) 5 x 10-6 T northward [AIEEE - 2008] (3) 5 x10-6 T southward (4) 2.5 x10-7 T northward

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[ begin{aligned} B &=frac{U_{0} I}{2 pi gamma} &=frac{10^{7} times 4^{1}+100}{2 times pi times 42} &=5 times 10^{-6} T end{aligned} ] According to right hand Rule magnetic field towards South (3) Answer

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