Four identical rods of mass `M = 6 kg` each are welded at their ends to form a square and then welded to a massive ring having mass `m = 4 kg` and radius `R = 1m`. If the system is allowed to roll down the incline of inclination `theta = 30^@`, determine the minimum value of the coefficient of static friction that will prevent slipping.

The moment of inertia of the system about the centre of ring will be

Options

A. `20 kg m^(2)`
B. `40 kg m^(2)`
C. `10 kg m^(2)`
D. `60 kg m^(2)`

Answer

A