Positive and negative point charges of equal magnitude are kept at $\left(0,0,\frac{a}{2}\right)\text{and}\left(0,0,\frac{-a}{2}\right)$, respectively. The work done by the electric field when another positive point charge is moved from $\left(-a,0,0\right)$ to $\left(0,a,0\right)$ is

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