JEE Main 2019 Physics question
A load of mass M kg is suspended from a steel wire of length 2 m and radius 1.0 mm in Searle's apparatus experiment. The increase in length produced in the wire is 4.0 mm. Now the load is fully immersed in a liquid of relative density 2. The relative density of the material of load is 8. The new value of increase in length of the steel wire is:
Answer: (C)
Solution
Tension falls to (1 − 2/8) = 3/4 of the weight: 3 mm.