A) \[\frac{1}{4\pi {{\in }_{0}}}\frac{qQ}{d(d+L)}\]
B) \[\frac{qQ}{4\pi {{\in }_{0}}d}\]
C) \[\frac{qQ}{2\pi {{\in }_{0}}d}\]
D) \[\frac{qQ}{8\pi {{\in }_{0}}d(d+L)}\]
Correct Answer: A
Solution :
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