The moment of inertia of an angular wheel shown in figure is 3200 ${\mathrm{kgm}}^2$. If the inner radius is 5 cm and the outer radius is 20 cm, and the wheel
is acted upon by the forces shown, then the angular acceleration of the wheel is

• A

  ${10}^{-1}$$\mathrm{rad}/{\mathrm{s}}^2$

• B

  ${10}^{-2} \mathrm{rad}/{\mathrm{s}}^2$

• C

  ${10}^{-3 }\mathrm{rad}/{\mathrm{s}}^2$

• D

  ${10}^{-4} \mathrm{rad}/{\mathrm{s}}^2$