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At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be

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a
0.01 T
b
0.02 T
c
0.08 T
d
0.16 T

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detailed solution

Correct option is A

B∝   Ir  ⇒  B1B2 = r2r1 ⇒ 0.04B2 = 4010 ⇒ B2 = 0.01 T


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