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can longitudinal strain be negative ? The question was " A steel rod is clamped at its two ends and rests on a fixed horizontal base. The rod is unstrained at 20 degree C. Find the long. strain developed in the rod if the temp rises to 50 degree C. The value of alpha is given." My answer comes as + ve where as the answer given in verma's book is -ve. Again in another worked out example the strain was +ve in the same book. ( Ref : Verma's book vol II, Heat and temp. prob.27 and worked out example of the same chapter no. 9)
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