The current of $5 \mathrm{~A}$ flows in a square loop of sides $1$ $\mathrm{m}$ is placed in air. The magnetic field at the centre of the loop is $\mathrm{X} \sqrt{2} \times 10^{-7} \mathrm{~T}$. The value of $\mathrm{X}$ is____.
JEE MAIN 2024, Diffcult
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$B=4 \times \frac{\mu_0 i}{4 \pi(1 / 2)}\left(\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{2}}\right)$
$=4 \times 10^{-7} \times 5 \times 2 \times \sqrt{2}$
$=40 \sqrt{2} \times 10^{-7} \mathrm{~T}$
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