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Homework Statement
Find magnetic flux density B circulation in closed contour. The countour consists of square with a perimeter of 4b. It includes a square conductor with a perimeter of 4a. A homogenic current flows through a conductor with a current density of j.
Homework Equations
∫B⋅dl=μ0⋅I[/B]
The Attempt at a Solution
I get this equation ∫B⋅dl=μ0⋅j⋅a2 but the answer says that the integration contour is Γ. How do I get the Γ? ∫ΓB⋅dl=μ0⋅j⋅a2