Question

Two blocks of masses m₁ and m₂ are joined by a wire of Young’s modulus Y via a massless pulley. The area of cross-section of the wire is S and its length is L. When the system is released, increase in length of the wire is

(a)  m₁m₂gL/YS(m₁ + m₂)

(b)   2m₁m₂gL/YS(m₁ + m₂)

(c)  (m₁ - m₂)gL/Ys(m₁ + m₂)

(d)   4m₁m₂gL/YS(m₁ + m₂)

Answer 1

Correct option (b)   2m₁m₂gL/YS(m₁ + m₂)

Explanation:

Tension in the wire  T