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Each of conductors shown in figure carries 2A of current into or out of page. Two paths are indicated for the line integral `oint overset(to)(B).overset(to)(d)I`. What is the value of the integral for the path (a) and (b).

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(a) `oint overset(to)(B).d overset(to)(I)= mu_(0) I = 2 mu_(0)` Tm
(b) zero
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