In cases figure (a) and (b), a positively charged particle of mass m and charge q is given velocity ‘v’ at the lowest point of a smooth fixed spherical shell of radius R.In both cases circular motion is in the plane of the paper. In case (b), magnetic field is also switched on in inward direction. If at point P, ${\text{v}}_{\text{1}}$ and  ${\text{v}}_2$, ${\text{N}}_{\text{1}}$ and  ${\text{N}}_2$, are velocities and normal forces in two cases respectively, then