A) \[{{120}^{o}}\]
B) \[~{{60}^{o}}\]
C) \[{{90}^{o}}\]
D) \[{{150}^{o}}\]
Correct Answer: A
Solution :
Stress \[\propto \]strain \[\frac{F}{A}=\Upsilon \frac{\Delta l}{l}\] \[\Delta l=\]elongation \[F=\]load \[\Upsilon =\] Young's modulus \[A=\]area \[l=\]length of wire \[F\propto {{r}^{2}}\] (radius of wire). \[\Delta l\propto \frac{1}{{{r}^{2}}}\] \[\therefore \]Thin wire max. elongation with min. load. Graph is OA.You need to login to perform this action.
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