A) \[\frac{KQ}{R}\]
B) \[\frac{KQ}{\ell }\]
C) \[\frac{KQ}{\sqrt{{{R}^{2}}+{{\ell }^{2}}}}\]
D) \[\frac{mg}{4K}\]
Correct Answer: A
Solution :
[a] \[mg\left( h+\frac{3mg}{K} \right)=\frac{1}{2}K{{\left( \frac{3mg}{K} \right)}^{2}}\]
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