Q. The dimensional formula of modulus of rigidity is
A) $\left\lbrack {ML}^{- 2}T^{- 2} \right\rbrack$
B) $\left\lbrack {ML}^{- 3}T_{2} \right\rbrack$
C) $\left\lbrack {ML}^{2}T^{- 2} \right\rbrack$
D) $\left\lbrack {ML}^{- 1}T^{- 2} \right\rbrack$
Explanation
Modulus of rigidity $\eta = \frac{F/A}{\phi}$ Dimensions of $\eta = \frac{\left\lbrack MLT^{- 2} \right\rbrack}{\left\lbrack L^{2} \right\rbrack}$ $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = \left\lbrack ML^{- 1}T^{- 2} \right\rbrack$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.