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On loading a metal wire of cross section $10^{- 6} m^{2}$ and length 2m by a mass of 210 kg it extends by 16mm and suddenly broke from the point of support. If density of that metal is $8000 k g m^{- 3}$ and its specific heat is $420 J k g^{- 1} K^{- 1}$ the rise in temperature of wire is $(g = 10 m s^{- 2})$

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detailed solution

Correct option is A

msΔT=12Fe ΔT=Fe2MS

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On loading a metal wire of cross section 10−6m2 and length 2m by a mass of 210 kg it extends by 16mm and suddenly broke from the point of support. If density of that metal is 8000kgm−3 and its specific heat is 420Jkg−1K−1 the rise in temperature of wire is (g=10ms−2)

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