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A horizontal overhead power line is at height of $4 m$ from the ground and carries a direct current of 100 A from east to west. The magnetic field directly below it on the ground is $(μ_{0} = 4 π \times 10^{- 7} T m A^{- 1})$

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2.5 × 10−7 northward

2.5 × 10−7 T southward

5 × 10−6 T northward

5 × 10−6 T southward

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detailed solution

Correct option is D

B=μ04 π2 Ir=10−7 × 2 × 1004 =5 × 10−6 T Southward.

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A horizontal overhead power line is at height of 4 m from the ground and carries a direct current of 100 A from east to west. The magnetic field directly below it on the ground is (μ0=4 π × 10−7 T m A−1)

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Ready to Test Your Skills?

free study material

A horizontal overhead power line is at height of $4 m$ from the ground and carries a direct current of 100 A from east to west. The magnetic field directly below it on the ground is $(μ_{0} = 4 π \times 10^{- 7} T m A^{- 1})$