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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=μ

_{0}⋅I[/B]

## The Attempt at a Solution

I get this equation

**∫B⋅dl=μ**but the answer says that the integration contour is Γ. How do I get the Γ?

_{0}⋅j⋅a^{2}**∫**

_{Γ}B⋅dl=μ_{0}⋅j⋅a^{2}