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(D) For a perfectly rigid body,the condition is that there should be no elongation $(\Delta L = 0)$ for any applied force.The formula for Young's modu

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Infinite

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(D) For a perfectly rigid body,the condition is that there should be no elongation $(\Delta L = 0)$ for any applied force.The formula for Young's modulus $(Y)$ is given by:$Y = \frac{F \cdot L}{A \cdot \Delta L}$Where:$F$ is the applied force,$L$ is the original length,$A$ is the cross-sectional area,$\Delta L$ is the change in length.Substituting $\Delta L = 0$ into the formula:$Y = \frac{F \cdot L}{A \cdot 0} = \infty$Therefore,the Young's modulus for a perfectly rigid body is infinite.

The value of Young's modulus for a perfectly rigid body is ...........

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