A) 20 cm
B) 10 cm
C) 33 cm
D) none of these
Correct Answer: C
Solution :
Let at point P electric field intensity is zero. \[\frac{K\times 10\times {{10}^{10-6}}}{{{x}^{2}}}=\frac{K\times 10\times {{10}^{-6}}}{\begin{align} & (80-{{x}^{2}}) \\ & x=33\,\text{cm} \\ \end{align}}\]
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