An iron bar of length and having a cross...

An iron bar of length and having a cross section A is heated from 0 to `100^@C`. If this bar is so held that it is not permitted to expand or bend, the force that is developed, is

inversely proportional to the cross sectional area of the har

independent of the length of the bar.

inversely proportional to the length of the

directly proportional to the length of the bar

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