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Units and Measurements — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsUnits and Measurements1 Mark
Question
Give an example of: A physical quantity which has a unit but no dimensions.
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Answer

Solid angle $\Omega=\frac{\text{A}}{\text{r}^2}$ steradian and a plane angle $\theta=\frac{\text{L}}{\text{r}}$ radian. Both are dimensionless but have units.

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