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Find oint vec(B).vec(dl) over following ...

Find `oint vec(B).vec(dl)` over following loops (direction in which integration has to be performed is indicated by arrows)

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(i) `mu_(0)i_(1)`
(ii) `-mu_(0)i_(2)`
(iii) `-2mu_(0)i`
(iv) `-2mu_(0)i`
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