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A brittle steel rod is heated to 160?C and then suddenly clamped at both ends. It is then allowed to cool and breaks at a temperature of 85?C. If E = 200 GN/m2 and ? = 12 x 10-5 / ?C, the breaking stress of steel is

[A].	60 MN / m2	[B].	90 MN / m2
[C].	180 MN / m2	[D].	360 MN / m2

Answer: Option C

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