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Q. The dimension of the modulus of rigidity, is

AIIMSAIIMS 1994Physical World, Units and Measurements

Solution:

The modulus of rigidity
$(\eta)=\frac{\text { Shearing stress }}{\text { Shearing strain }} $
$=\frac{F / A}{\phi}=\frac{\left[ MLT ^{-2}\right]}{\left[ L ^{2}\right]} $
$=\left[ ML ^{-1} T ^{-2}\right]$