A) F
B) 4F
C) 6F
D) 9F.
Correct Answer: D
Solution :
\[{{\ell }_{1}}=3{{\ell }_{2}}\] \[Y=\frac{F}{A}\times \frac{{{\ell }_{1}}}{\Delta x}\] ?(i) \[Y=\frac{F'}{3A}\times \frac{{{\ell }_{1}}/3}{\Delta x}\] ?(ii) \[\frac{F}{A}\times \frac{{{\ell }_{1}}}{\Delta x}=\frac{F'}{3A}\times \frac{{{\ell }_{1}}}{3\Delta x}\] \[F'=9F\]
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