A horizontal overhead power line is at a 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

Question

A horizontal overhead power line is at a 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, 2.5 × 10 - 7 T northwards, 2.5 × 10 - 7 T southwards, 5 × 10 - 6 T northwards, 5 × 10 - 6 T southwards

MARKS App · Accepted Answer

By Ampere's theorem, B → · 2 π d = μ 0 i B → = μ 0 i 2 π d = 4 π × 10 -7 × 100 A 2 π × 4 m = 5 × 10 - 6 T southwards

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