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10-1.Thermometry, Thermal Expansion and Calorimetry
medium
If the length of a cylinder on heating increases by $2\%$, the area of its base will increase by ....... $\%$
A
$0.5$
B
$2$
C
$1$
D
$4$
Solution
(d) $A \propto {L^2}$ ==> $\frac{{\Delta A}}{A} = 2 \cdot \frac{{\Delta L}}{L}$ ==> $\frac{{\Delta A}}{A} = 2 \times 2 = 4\% $.
Standard 11
Physics