A steel wire of diameter 0.5 mm and Young's modulus $2 imes 10^{11} \mathrm{~N} \mathrm{~m}^{-2}$

Question

A steel wire of diameter 0.5 mm and Young's modulus $2 	imes 10^{11} \mathrm{~N} \mathrm{~m}^{-2}$ carries a load of mass $M$. The length of the wire with the load is 1.0 m . 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 1.0 mm , 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 1.2 kg , the vernier scale division which coincides with a main scale division is ________ Take $g=10 \mathrm{~m} \mathrm{~s}^{-2}$ and $\pi=3.2$.\

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