Two geared shaft A and B having moments of inertia $I_{a}$ and $I_{a}$ and ngular acceleration $\alpha _{a}$ and $\alpha _{b}$ respectively are meshed together. B rotates at G times the speed of (A) If the gearing efficiency of the two shafts in $\eta$ then in order to accelerate B, the torque which must be applied to A will be
