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What is the magnetic field at the center of the circular current loop?

$\begin{array}{1 1} (a)\;B=\large\frac{\mu_0I}{2 \pi}\\ (b)\;B=\large\frac{\mu_0I}{2 \pi r} \\ (c)\;B=\large\frac{\mu_0I}{2 r} \\ (d)\;I=\frac{\mu_0I}{\pi} \end{array} $

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