A rod is subjected to a uni-axial load within linear elastic

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A rod is subjected to a uni-axial load within linear elastic limit. When the change in the stress is 200 MPa, the change in the strain is 0.001. If the Poisson's ratio of the rod is 0.3, the modulus of rigidity (in GPa) is

1. 76.92
2. 76.22
3. 76.72
4. 76

Correct Option: A

E	σ	+	200 × 10⁶	= 200GPa
	t		0.001

G =	200	= 76.92GPa
	2(1 + 0.3)