A) \[\frac{qQ}{4\pi {{\varepsilon }_{0}}a}\]
B) \[\frac{qQ}{4\pi {{\varepsilon }_{0}}{{a}^{2}}}\]
C) \[\frac{q}{4\pi {{\varepsilon }_{0}}a}\]
D) zero
Correct Answer: D
Solution :
The work done is zero because displacement is zero.
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