MCQ Solution: Properties of Bulk Matter
A steel wire of length 30 cm is stretched to increase its length by 0.2 cm. Find the lateral strain in the wire if the poisson's ratio for steel is 0.19 :
1) 0.0019.
2) 0.0008.
3) 0.019
4) 0.008
Solution
Poisson's ratio $$=-\cfrac{\epsilon_{lateral}}{\epsilon_{Longtudinal}}$$$$\epsilon_{longitudinal}=\cfrac{\triangle L}{L}=\cfrac{0.2}{20}$$$$\therefore \epsilon_{lateral}=-\cfrac{0.2}{20}\times 0.19$$$$=-0.0019$$$$|\epsilon_{lateral}|=0.0019$$
Poisson's ratio $$=-\cfrac{\epsilon_{lateral}}{\epsilon_{Longtudinal}}$$
$$\epsilon_{longitudinal}=\cfrac{\triangle L}{L}=\cfrac{0.2}{20}$$
$$\therefore \epsilon_{lateral}=-\cfrac{0.2}{20}\times 0.19$$
$$=-0.0019$$
$$|\epsilon_{lateral}|=0.0019$$
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