Steel wire of length 'L' at 42^0C is suspended from the ceiling and then a mass 'M' is hung from its free...

Question

Steel wire of length 'L' at 42^0C is suspended from the ceiling and then a mass 'M' is hung from its free end. The wire is cooled down from 42^0C to 32^0C to regain its original length 'L'. The coefficient of linear thermal expansion of the steel is 10^ -5 /^0C, Young's modulus of steel is 2 10^ 11 N/m^2 and radius of the wire is 2 mm. Assume that L diameter of the wire, then the value of 'M' in kg is ___ (g=10 m/s^2, =3.14)

Accepted Answer

25.12

JEE Main Physics question

Solution

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