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L लम्बाई तथा A अनुप्रस्थ-काट के क्षेत्रफल का एक तार l लम्बाई से खिंचा जाता है | यदि तार के पदार्थ का यंग-प्रत्यास्थता गुणांक Y है, तो बल नियतांक क्या है ?

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संकेत : `Y=(F//A)/(l//L)" ":.(F)/(l)=(YA)/(L)`
यदि तार का बल नियतांक k हो, तो `F="k l"`
`:.k=(F)/(l)=(YA)/(L).`

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