Hello student!
The moment of Inertia of the disc = 1 kg/m^2
The moment of inertia of wax =MR^2 =(50/1000)* (20/100)^2 =0.002 kg/m^2
Increase in Moment if inertia= Moment of inertia of wax =0.002 kg/m^2
Hence, the change in inertia is calculated as 0.002 kg/m^2.
Hope this solution cleared your doubt!
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