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A copper rod 15 mm diameter 0.8 m long is heated through 50?C. The expansion of the rod is prevented by gripping it at both ends. When the grips do not yield, the stress in rod is 115 N/mm2 and forces applied at the grips are 20 kN. In case one of the grip yields by 0.5 mm

[A].	the rod will be under tension	[B].	the force at grips will be increase
[C].	the compressive stress in the rod will increase	[D].	the compressive stress in the rod will reduce

Answer: Option D

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