$PQ$ and $RS$ are long parallel conductors separated by certain distance. $M$ is the mid-point between them (see the figure). The net magnetic field at $M$ is $B$ . Now, the current $2\,A$ is switched off. The field at $M$ now becomes
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$\vec {\mathrm{M}}=\mathrm{I} \vec {\mathrm{A}}$
$\mathrm{B}_{\mathrm{R}}=\mathrm{B}_{1}-\mathrm{B}_{2}=2 \mathrm{B}-\mathrm{B}=\mathrm{B}$
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