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  4. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/ded11c3437e9fb5824a803f8c56cfc82-.png /> Statement I: Figure shows a current carrying circular loop. The magnetic field at the centre of loop is zero. Statement II: Magnitude of magnetic field at the centre of circular loop carrying current i is given by B=(μ0 n i/R).

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Statement I: Figure shows a current carrying circular loop. The magnetic field at the centre of loop is zero.
Statement II: Magnitude of magnetic field at the centre of circular loop carrying current $i$ is given by $B=\frac{\mu_0 n i}{R}$.

Moving Charges and Magnetism

Solution:

The magnetic field of two equal halfs of the loop is equal and opposite and so $\vec{B}=0$.