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

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mfi

 

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

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