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  4. A wire carrying a current of 4 A is in the form of a circle. It is necessary to have a magnetic field of induction π × 10-5 T at the centre. The radius of the circle must be

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Q. A wire carrying a current of $4\,A$ is in the form of a circle. It is necessary to have a magnetic field of induction $\pi \times 10^{-5} \,T$ at the centre. The radius of the circle must be

Moving Charges and Magnetism

Solution:

$r=\frac{\mu_0\,ni}{2B}$