Question

a fixed volume of iron is drawn into a wire of length L the extension X produced in the wire by a constant force f is proportional to dash


a .1/L^2
b.1/L
c.L^2
D.L
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Answer 1

Answer:

Correct option: (C) L2 Explanation: Y = {(F/A) / (ℓ/L)} = (FL / Aℓ) given : extension ℓ = x ℓ = (FL / AY) i.e. x = (FL / AY) = [{FL2} / {(AL)Y}] (1) as volume = V = Area × length i.e. V = AL hence from (1) , x = (FL2 / VY) F is given to be constant, Y is constant. if volume is fixed then x ∝ L2 Read more on Sarthaks.com - https://www.sarthaks.com/334621/fixed-volume-iron-drawn-into-length-extension-produced-this-constant-force-proportional