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Q.

A current of 1/ 4π amp is flowing in a long straight conductor. The line integral of magnetic induction around a closed path enclosing the current carrying conductor is

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a

zero

b

16π2×10−7 webre/metre

c

10–7 weber per metre

d

4π×10−7 weber per metre

answer is A.

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Detailed Solution

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∫B.dl=μ0i=4π×10−7×14π=10−7wb/m

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