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Q.

A current of 1/(4π) ampere 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

10−7Wbm−1

b

4π× 10−7Wb m−1

c

16π2× 10−7Wb m−1

d

zero

answer is A.

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Detailed Solution

∮B→.dl→=μ0Ienclosed=4π×10−7×14π
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