A) \[\frac{-q}{1+\sqrt{2}}\]
B) \[\frac{-2q}{2+\sqrt{2}}\]
C) \[-2q\]
D) \[+q\]
Correct Answer: B
Solution :
Net electrostatic energy \[U=\frac{kQq}{a}+\frac{k{{q}^{2}}}{a}+\frac{kQq}{a\sqrt{2}}=0\] \[\Rightarrow \,\frac{kq}{a}\left( Q+q+\frac{Q}{\sqrt{2}} \right)=0\] Þ \[Q=-\frac{2q}{2+\sqrt{2}}\]You need to login to perform this action.
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