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# What is magnetic field intensity at centre of current carrying loop(Circle)

1) B= $\frac{\mu_oI}{4r}$

2) B= $\frac{\mu_oI}{2r}$

3) B= $\frac{\mu_oI}{2 \pi r}$

4) B= $\frac{\mu_oI}{4 \pi r}$

Correct Answer : 2