A uniform bar of square cross-section is lying along a frictionless horizontal surface. A horizo...

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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
(a) the bar is under same stress throughout its length
(b) the bar is not under any stress because force has been applied only at one end
(c) the bar simply moves without any stress in it
(d) the stress developed gradually reduces to zero at the end of the bar where no force is applied
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