A) 2L
B) L/4
C) 8L
D) 4L
Correct Answer: A
Solution :
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.You need to login to perform this action.
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