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  4. Which of the following is a dimensionless quantity?

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Q. Which of the following is a dimensionless quantity?

Physical World, Units and Measurements

Solution:

Strain $=\frac{\text { Change in length }}{\text { Original length }}$
$=\frac{[ L ]}{[ L ]}=\left[ L ^{0}\right]$
Therefore strain is a dimensionless quantity.