Consider a thin metallic sheet perpendicular to the plane of the paper moving with speed $\mathrm{v}$ in a uniform magnetic field $\mathrm{B}$ going into the plane of the paper (see figure). If charge densities ${\mathrm{\sigma }}_1$ and ${\mathrm{\sigma }}_2$ are induced on the left and right surfaces respectively of the sheet, then (ignore fringe effects)