Questions
The length of an elastic string is a meter when the longitudinal tension is and meter when the longitudinal tension is . The original length of the string in meter is
a
a−b
b
5a-4b
c
2b−14a
d
4a−3b
detailed solution
Correct option is B
Using Hooke’s law, F=Kx we can write 4=k(a−ℓ0) …. (i)and 5=k(b−ℓ0) …. (ii)divide (1) by (2)45=k(a−ℓ0)k(b−ℓ0)⇒4b-4ℓ0=5a-5ℓ0⇒ℓ0=5a-4bTalk to our academic expert!
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