Five long wires $A,B,C,D$ and $E$ each carrying current I are arranged to form edges of a pentagonal prism as shown in figure. Each carries current out of the plane of paper . What if current in one of the wires (say) A is reversed ?

Question

$\begin{array}{1 1}\frac{\mu_0}{4 \pi} .\frac{I}{R} \text{ acting perpendicular to OA towards right} \\ \frac{\mu_0}{4 \pi} .\frac{I}{R} \text{ acting perpendicular to AO towards right} \\ \frac{\mu_0}{4 \pi} .\frac{I}{R} \text{ acting perpendicular to OA towards left} \\ \frac{\mu_0}{4 \pi} .\frac{I}{R} \text{ acting perpendicular to AO towards left} \end{array} $