At , a brass wire of 1 mn 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 to 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 and , respectively ; )
also we know
As is closet to
hence option (1) is correct
Option 1)
Option 2)
Option 3)
Option 4)
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