Which of the following rods of same material undergoes maximum elongation

Which Of The Following Rods Of Same Material Undergoes Maximum Physics QuestionWhich Of The Following Rods Of Same Material Undergoes Maximum Physics Question

Which of the following rods of same material undergoes maximum elongation when subjected to a given force?

Options

(a) l=1 m, d=2 mm
(b) l=2 m, d=1 mm
(c) l=1 m, d=1 mm
(d) l=2 m, d=2 mm

Correct Answer:

l=2 m, d=1 mm

Explanation:

Δl(elongation) = Fl/YA
F is same. Young modulus is same.
.·. Δl α 1/r² .

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