JEE Advanced · 2018 · 20 May 2018 · Paper 2 · Elasticity & SHM

A steel wire of diameter $0.5mm$ and Young's modulus $2\times 10^{11}N{m}^{-2}$ carries a load of mass $M$. The length of the wire with the load is $1.0m$. A vernier scale with 10 divisions is attached to the end of this wire. Next to the steel wire is a reference wire to which a main scale, of least count $1.0mm$, is attached. The 10 divisions of the vernier scale correspond to 9 divisions of the main scale. Initially, the zero of vernier scale coincides with the zero of main scale. If the load on the steel wire is increased by $1.2kg$, the vernier scale division which coincides with a main scale division is ____. Take $g=10m{s}^{-2}$ and $\pi =3.2$.