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A tungsten wire of length 20 cm is stretched by 0.1 cm. Find the strain on the wire.

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0.004

0.005

0.002

0.001

answer is B.

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Detailed Solution

l = 20cm; Δl = 0.1cm
$\large Strain=\frac {\Delta l}{l}=\frac {0.1}{20}=\frac 12\times10^{-2}=0.005$

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