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Six wires of current I1 = 1A, I2 = 2 A, ...

Six wires of current `I_1 = 1A, I_2 = 2 A, I_3 = 3A, I_4 = 1A, I_5 = 5A` and `I_6 = 4A` cut the page perpendicularly at the points 1, 2,3,4,5 and 6. respectively as shown in the figure . Find the value of the integral ` oint vec B.d vec1` around the closed path.

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`mu_0 " weber."m^(-1)`
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