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D e a r S t u d e n t, W e k n o w Y o u n g s M o d u l u s Y = \frac{F l}{A ∆ l} T h u s ∆ l = \frac{F l}{A Y} = \frac{F l}{{πr}^{2} Y} F o r s a m e m a t e r i a l a n d F o r c e F a n d Y c o n s \tan t T h u s, ∆ l \infty \frac{l}{r^{2}} F o r g i v e n o p t i o n s A) \frac{l}{r^{2}} = \frac{3000 m m}{3^{2}} = \frac{3000}{9} = 333.33 B) \frac{l}{r^{2}} = \frac{500 m m}{5^{2}} = 20 C) \frac{l}{r^{2}} = \frac{2000 m m}{2^{2}} = 500 D) \frac{l}{r^{2}} = \frac{2000 m m}{3^{2}} = 222.22 T h u s \frac{l}{r^{2}} i s m i n i m u m f o r (B) T h u s m i n i m u m e l o n g a t i o n f o r (B) R e g a r d s

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