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Physics - Elasticity Question with Solution | TestHub

PhysicsElasticityMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

If a force is applied to an elastic wire of the material of Poisson's ratio $0.2$ there is a decrease of the cross-sectional area by $1 %$ . The percentage increase in its length is:

Options:

Answer:

Solution:

$a = π r^{2} \Rightarrow \frac{d A}{A} = 2 \frac{d r}{r} \Rightarrow \frac{d r}{r} = 0.5 %$
Poisson's ratio as $σ = \frac{- d r / r}{d l / l} \Rightarrow \frac{d l}{l} = 2.5 %$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:ElasticitySubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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