question_answer

In the figure (i) as extensible string is fixed at one end and the other end is pulled by a tension T. In figure (ii) another identical string is pulled by tension T at both the ends. The ratio of elongation in equilibrium of string in (i) to the elongation of string in (ii) is

A)  1 : 1                      

B)  1 : 2

C)  2 : 1                      

D)  0

Correct Answer: A

Solution :

Tension in both strings shall be same which can be observed by making FBD of string in figure (i). FBD of string in figure (i)