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An elastic metal rod will change its length when it
 

Option: 1

Falls vertically under its weight
 


Option: 2

Is pulled along its length by a force acting at one end
 


Option: 3

Is stretched by equal and opposite force at its both ends
 


Option: 4

Both (2) and (3)


Answers (1)

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Answer (4)

Stress is developed in case (2) and (3)

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Sayak

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