A thin non-conducting disc of mass M = 2kg, charge  ${\text{Q=2×10}}^{\text{-2}}\text{C}$  and radius  $\text{R=}\frac{\text{1}}{\text{6}}\text{m}$ is placed on a frictionless horizontal plane with its centre at the origin of the coordinate system. A non-uniform, radial magnetic field $\overline{B}=B_0\widehat{r}$  exists in space, where  ${\text{B}}_{\text{0}}\text{=10T}$ and the disc is rotated with an angular velocity $\omega \text{=x}\times {\text{10}}^2$ rad/sec about an axis passing  through its centre and perpendicular to its plane, as shown in the figure. At what value of $\mathrm{x}$ the disc will leave contact with the surface. (Take $g=10\frac{m}{s^2}$  )