Question

if one newton force is applied on a wire having a cross section area 1 square metre then stress produced in wire is

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Answer 1

Work done =21×stress×strain×volume

                    =21×Y×(strain)2×volume

                    =21×Y×(LI)2×AL

                    =21×Y×L2I2×AL

                    =2LYI2A

                    =2LYI2A

Hence, the answer is 2LYI2A.