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Asked by Rakesh Last Modified
Answer Answer : Infinity
A perfectly rigid body is one for which strain is zero whatever may be the stress.
Young's modulus is defined as
Since strain is zero, Young's modulus for a perfectly rigid body is infinity.
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Infinity ∞
Let's understand what a rigid body is. Rigid bodies are those does not deform for any given force. If there is no deformation it means no strain on the part. Going by the equation
Young's modulus (E) = Stress (σ) / Strain (ξ)
Since the denominator is zero, E is infinity.
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The young 's Modulus for a perfect rigid body as
perfectly rigid body is one for which strain is zero whatever may be the stress.
Young's modulus is defined as
Since strain is zero, Young's modulus for a perfectly rigid body is infinity and young modulus for a perfect infinity thereof.
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