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Q.

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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a

2.50C

b

50C

c

60C

d

100C

answer is A.

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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)