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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0.01 T

0.02 T

0.08 T

0.16 T

answer is A.

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Detailed Solution

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

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