Assertion :When a rod is pulled by a force acting on one end (longitudinally) then there will be no longitudinal stress in the rod. (Assume surface is friction-less ) Reason: Longitudinal stress is internal normal force per unit area.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion We know that in elasticity, applied external force produces deformation, hence,when force is applied from only one side,it will not produce longitudinal stress as there is no opposing force. Statement II i.e. Longitudinal force is internal force per unit area is correct but not the correct explanation for the statement 1. Thus B is correct.