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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