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An iron bar of length L and area of cros...

An iron bar of length L and area of cross section A is heated from `10^circ C` to `90^circ C`, The bar is so held between supports that it is neither allowed to extend nor allowed to bend If the stress developed in the bar be S, then

A

`S prop L`

B

`S prop 1/L`

C

`S prop A`

D

`S prop 1/A`

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