Dimensions of Physical QuantitiesHardQuestion 5036
Question
The dimensional formula of coefficient of viscosity η is:
- A[ML⁻¹T⁻¹]Correct
- B[MLT⁻¹]
- C[ML⁻²T⁻¹]
- D[ML²T⁻²]
Correct answer
[ML⁻¹T⁻¹]
Explanation
From Newton's law of viscosity: F = ηA(dv/dx). η = F/(A × dv/dx) = [MLT⁻²]/([L²][T⁻¹]) = [ML⁻¹T⁻¹].