Young’s modulus of perfectly rigid body material is

Q: Young’s modulus of perfectly rigid body material is

(a) zero

(b) infinity

(c) 1 × 1010 N/m2

(d) 10 × 1010 N/m2

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Ans: (b)

Sol: Young’s Modulus = Stress/Strain

For a rigid body Whatever be the value of Stress , Strain is always zero . Hence Young’s modulus is infinite .