A) \[\frac{MgL}{{{n}^{2}}}\]
B) \[\frac{MgL}{2{{n}^{2}}}\]
C) \[\frac{2MgL}{{{n}^{2}}}\]
D) \[nMgL\]
Correct Answer: B
Solution :
[b] Mass of the hanging part \[=\frac{M}{n}\] |
\[{{h}_{COM}}=\frac{L}{2n}\] |
work done \[W=mg{{h}_{COM}}=\left( \frac{M}{n} \right)g\left( \frac{L}{2n} \right)=\frac{MgL}{2{{n}^{2}}}\] |
Option [b] |
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