In the previous question, if the current is $i$ and the magnetic field at $D$ has magnitude $B$,
Diffcult
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The magnitude of the magnetic field depends only on the distance from the $x$ $-axis.$ Point $A$ and $C$ are at distance of $1$ unit each from the $\mathrm{x}$ $-axis$. Points $\mathrm{B}$ and $\mathrm{D}$ are at distance of $\sqrt{2}$ unit each from the $x-axis.$ Magnetic field at point
$\mathrm{D}$ $B=\frac{\mu_{0} I}{1 \sqrt{2} \pi}$
It is obvious that $B$ is inclined at an angle of $45^{\circ}$ with the $x-y$ plane.
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