$P Q R S$ is a square loop made of uniform conducting wire the current enters the loop at $P$ and leaves at $S$ . Then the magnetic field will be

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maximum at the centre of the loop

zero at all points inside the loop

zero at all points outside of the loop

zero at the centre of loop

answer is B.

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Detailed Solution

Magnetic field at the centre of the loop,

$B = 3 [\begin{matrix} \frac{μ_{0}}{4 π} . & \frac{\frac{i}{4}}{r} (\sin 45 ° + \sin 45 °) \end{matrix}] - [\begin{matrix} \frac{μ_{0}}{4 π} . & \frac{\frac{3 i}{4}}{r} (\sin 45 ° + \sin 45 °) \end{matrix}] = 0$

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