What is lateral strain?

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(B) Lateral strain is defined as the ratio of the change in the lateral dimension (such as diameter or width) of a body to its original lateral dimens

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The ratio of change in diameter to original diameter.

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(B) Lateral strain is defined as the ratio of the change in the lateral dimension (such as diameter or width) of a body to its original lateral dimension when it is subjected to a longitudinal stress.If a wire of diameter $D$ undergoes a change in diameter $\Delta D$ due to an applied force,the lateral strain is given by the formula: $	ext{Lateral Strain} = \frac{\Delta D}{D}$.It is dimensionless and is typically associated with the Poisson's ratio,which relates lateral strain to longitudinal strain.

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