At 40^\circ C ,a brass wire of 1 mm radius is hung from the ceiling. A small mass, M is hung from the free end of the wire. When the wire is cooled down from 40^\circ C to 20^\circ C it regains its original length of 0.2 m. The value of M is close to. (Coefficientof linear expansion and Young’s modulus of brass are 10^{-5} \ ^{0}{C} and 10^{11} N/m_2 respectively ; g = 10 ms^{-2} ) [12 Apr 2019 Shift 1]

JEE Main 12 Apr 2019 Paper 1 Solved Paper

Section: Physics

Question : 27 of 90

Marks: +1, -0

At 40°C ,a brass wire of 1 mm radius is hung from the ceiling. A small mass, M is hung from the free end of the wire. When the wire is cooled down from 40°C to 20°C it regains its original length of 0.2 m. The value of M is close to. (Coefficientof linear expansion and Young’s modulus of brass are 10−5 \ 0C and 1011 N/m2 respectively ; g = 10 ms‌−2 )

[12 Apr 2019 Shift 1]

9 kg
0.9 kg
0.5 kg
1.5 kg

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