A long straight wire carries a current along the $x$-axis. Consider the points $A(0, 1, 0), B(0, 1, 1), C(1, 0, 1)$ and $D(1, 1, 1)$. Which of the following pairs of points will have magnetic fields of the same magnitude?
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$B=\frac{\mu_{0}}{4 \pi} \frac{2 I}{R}$ where is that distance from wire which is $1$ for $A$ and $C$ and $\sqrt{2}$ for $B$ and $C$
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