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PhysicsJEE Main 4 Apr 2026, Shift 1·Q9·MCQ·Easy–moderate

Mechanical Properties of Solids · Elasticity

A string A of length 0.314 m of Young's modulus 2×1010 N/m22\times10^{10}\ \mathrm{N/m^2} is connected to another string B of length and Young's modulus both twice of those of A. This series combination of strings is then suspended from a rigid support and its free end is fixed to a load of mass 0.8 kg. The net change in length of the combination is mm.
(radius of both the strings is 0.2 mm and acceleration due to gravity =10 m/s2= 10\ \mathrm{m/s^2})
(Mass of both strings is to be neglected as compared to the mass of load)
  1. (1)3
  2. (2)2
  3. (3)1.9
  4. (4)1

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