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Q.

A uniform bar of square cross-section is lying along a frictionless horizontal surface. A horizontal force is applied to pull it from one of its ends. Then

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a

the bar is under same stress throughout its length.  

b

the strain is zero at the end of the bar where force is applied.

c

the stress developed is zero at the end of the bar where force is applied.

d

the stress developed is zero at the end of the bar where no force is applied

answer is D.

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Detailed Solution

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Maximum restoring force develops at the end where force is applied. This force decreases linearly such that it becomes zero at the other end so stress also decreases linearly.

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