At the centre of which of the following four | vedclass

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(A) The magnetic field $B$ at the centre of a circular current-carrying coil is given by the formula $B = \frac{\mu_0 I}{2R}$,where $\mu_0$ is the per

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(A) The magnetic field $B$ at the centre of a circular current-carrying coil is given by the formula $B = \frac{\mu_0 I}{2R}$,where $\mu_0$ is the permeability of free space,$I$ is the current,and $R$ is the radius of the coil.Since the current $I$ is equal for all rings,the magnetic field $B$ is inversely proportional to the radius $R$ of the ring $(B \propto \frac{1}{R})$.Therefore,the smaller the radius $R$,the larger the magnetic field $B$ at the centre.Thus,the ring with the smallest radius will have the maximum magnetic field at its centre.

At the centre of which of the following four circular rings has the maximum magnetic field while passing equal current through each of them?

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