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ताम्बे के एक तार की लम्बाई 100 सेमी है । इसके ताप को `30^(@)C ` से `50^(@)C ` तक बढ़ाने में इसकी लम्बाई में कितनी वृद्धि होगी ? ताम्बे के लिए `alpha = 26 xx 10^(-6) //^(@) C ` होता है

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`l= 100 cm, T = 50^(@)C - 30^(@) =20^(@) C , alpha = 26 xx 10^(-6) //^(@) C `
`Delta l = alpha . l . Delta T `
`= 26 xx 10^(-6) //^(@) Cxx 100 xx 20 `
`= 0.000026xx 100 xx 20`
`= 0.052cm`.
अभीष्ट लम्बाई `= 100 + 0.052 `
`= 100.052`

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