Rotational Motion · Rotational dynamics

Two circular discs of radius each 10 cm are joined at their centres by a rod of length 30 cm and mass 600 gm as shown in figure.

If the mass of each disc is 600 gm and applied torque between two discs is $43\times10^{5}$ dyne cm, the angular acceleration of the discs about the given axis $AB$ is $\mathrm{rad/s^2}$.