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 will be the magnetic induction at a point on the axis =0 ? Axis is at a distance R from each wire ?

Question

$\begin{array}{1 1} 0 \\ 5 \\ -5 \\ \pm 5 \end{array} $