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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2.5 × 10−7 northward

2.5 × 10−7 T southward

5 × 10−6 T northward

5 × 10−6 T southward

answer is D.

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Detailed Solution

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

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