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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
[Coefficient of linear expansion and Young's modulus of
brass are 10-5/°C and 10¹1 N/m² respectively, g = 10 ms 2]
(b) 0.5 kg (c) 1.5 kg
(d) 0.9 kg
(a) 9 kg

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