The length of an elastic string is a meter when the longitudinal tension is 4 N and b meter when the longitudinal tension is 5 N. The length of the string in meter when the longitudinal tension is 9 N is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Let L is the original length of the wire and K is force constant of wire.
Final length = initial length + elongation
For first condition 
…(i)
For second condition 
…(ii)
By solving (i) and (ii) equation we get
and 
Now when the longitudinal tension is 9N, length of the string = 
= 
.
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