A) \[R\sqrt{2}\]
B) R
C) \[\frac{R}{\sqrt{5}}\]
D) \[\frac{R}{\sqrt{2}}\]
Correct Answer: D
Solution :
\[E\,\,\,\,=\,\,\,\,\frac{kQx}{{{({{R}^{2}}+{{x}^{2}})}^{3/2}}}\] For \[{{E}_{\max }}\] \[\frac{dE}{dx}\,\,=\,\,0\] On solving we get \[x\,\,=\,\,\frac{R}{\sqrt{2}}\] So, option is correct.You need to login to perform this action.
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