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नियत आयतन V के ताँबे से l लम्बाई का एक तार बनाया गया है | इस तार पर एक नियत (अचर) बल F लगाने से, इसकी लम्बाई में `Deltal` वृद्धि हो जाती है, तो निम्नलिखित में से कौन-सा ग्राफ सरल रेखा होगा ?
A. `Deltal" तथा "1//l" के बीच "`
B. `Deltal" तथा "l^(2)" के बीच "`
C. `Deltal" तथा "1//l^(2)" के बीच "`
D. `Deltal" तथा "l" के बीच |"`

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`V=Al`
`Y=(F//A)/(Deltal//l)=(Fl)/(ADeltal)`
`Deltal=(Fl)/(YA)=(F)/(Y)(l^(2))/(V)=(F)/(YV)l^(2)`
`:.Deltal prop l^(2).`

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