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Q.

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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a

2.5  ×  10−7  northward

b

2.5  ×  10−7 T   southward

c

5  ×  10−6 T  northward

d

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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