A symmetric star conducting wire loop is carrying a steady state current $\mathrm{I}$ as shown in figure. The distance between the diametrically opposite vertices of the star is $4 a$. The magnitude of the magnetic field at the center of the loop is
IIT 2017, Medium
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$B=12\left(\frac{\mu_0 I}{4 \pi a}\right)(\sin 60-\sin 30)$
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