Question

What is the Young’s modulus for a perfect rigid body.

Answer 1

Young’s Modulus, Y = \(\frac{F}{A}\) × \(\frac{l}{∆l}\)

A rigid body cannot be deshaped by applying any deforming force, ∴ ∆l = 0.

Or Y = \(\frac{F}{A}\) × \(\frac{l}{0}\) = ∞

∴ For perfect rigid body, Young’s modulus is infinity