A) 2L
B) L/4
C) 8L
D) 4L
Correct Answer: A
Solution :
[a] Suppose that a point B, where net electric field is zero due to charges 8 q and |
The electric field at B due charge 8 q at O, |
and the electric field at B due to charge -2q at A, |
According to condition, |
\[\frac{1}{4\pi {{\varepsilon }_{0}}}\,\frac{8q}{{{a}^{2}}}\,=\frac{1}{4\pi {{\varepsilon }_{0}}}\,\frac{2q}{{{(a+L)}^{2}}}\] |
Thus, at distance 2L from origin, net electric field will be zero. |
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