Physics - Magnetism Question with Solution | TestHub

Four infinitely long wires A, B, C and D pass through vertices of a square as shown. P is a point, midway between A and B, is a point of zero field. If ${\mathrm{I}}_{\mathrm{A}}={\mathrm{I}}_{\mathrm{B}}$ and ${\mathrm{I}}_{\mathrm{D}}={\mathrm{I}}_{\mathrm{C}}$, then what would be value to ${\mathrm{I}}_{\mathrm{D}}/{\mathrm{I}}_{\mathrm{A}}$ ?