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