A) \[\frac{1}{2}{{L}^{2}}l\]
B) \[\frac{1}{2}L{{l}^{2}}\]
C) \[L{{l}^{2}}\]
D) \[{{L}^{2}}l\]
Correct Answer: B
Solution :
(b) \[\frac{1}{2}L{{l}^{2}}\]
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