physics
posted by duke .
A steel rod of length 1m is heated from 25°c to 75°c keeping its length constant.The longitudinal strain developed in the rod is:(steel:12 X 10^6/°c)
"6X10^4" ; "6X10^4" ; "0"
please help me as soon as possible by explain this.

there may be a lot of stress but there is no strain if the length is constant.
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