The length of an elastic string is a meter when the tension is 4 N and b meter when the tension is 5 N. The length (in m), when the tension is 9 N, is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Let l be the natural length and 
be the force constant of wire, then
and 
… (ii)
On solving Eqs. (i) and (ii), we get
Now, when 
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