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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Units and Measurement
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The radius of a wire is $0.24 \;mm$ . Then its area of cross- section by taking significant figures into consideration is

$\begin{array}{1 1} 0.1 \;mm^3 \\ 0.2 \;mm^3 \\ 0.18 \;mm^2 \\0.180\;mm^2 \end{array} $

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Answer :$ 0.18 \;mm^2 $
Area of cross -section $= \large\frac{22}{7} $$ \times 0.24 \times 0.24 \;mm^2$
$\qquad= 0.18 \;mm^2$
answered Aug 12, 2014 by meena.p

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