The dimensional formula of modulus of rigidity is

Explanation:

The modulus rigidity is the ratio of stress and strain.

The strain is unitless and the stress is the pressure.

So the dimension of Modulus rigidity

Force/Area = [ML^-1T^-2]/[L²]

= [ML^-1T^-2]

Final Answer:

The correct option is (D). [ML^-1T^-2]