A charged particle of mass m and charge Q is projected from the origin of a three dimensional cartesian co-ordinate system. A uniform magnetic field $\overrightarrow{\mathrm{B}}={\mathrm{B}}_0\hat{\mathrm{j}}$ exists in that region. If velocity of projection is $\overrightarrow{\mathrm{v}}={\mathrm{v}}_0(\hat{\mathrm{i}}+\hat{\mathrm{j}})$ The particle will pass through the y-axis for the first time at a distance 'd' from the origin, where d is equal to