# Illustration Integration Path Around a Current-Carrying Coil

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Selected rectangular integration path (rectangular loop) around a current-carrying coil to use Ampere's law to calculate the magnetic field inside the coil. The rectangular loop is composed of four integration paths: $$\mathcal{S}_1$$, $$\mathcal{S}_2$$, $$\mathcal{S}_3$$ and $$\mathcal{S}_4$$.

The loop is 'punctured' by the current $$N$$ times.