What is the mechanical work done in pulling the slab out of the cap...

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What is the mechanical work done in pulling the slab out of the capacitor after disconnecting it from the battery
\( \mathrm{P} \)
(A) \( \frac{1}{2} \mathrm{E}^{2} \mathrm{C}\left(\varepsilon_{r}-1\right) \)
(B) \( E^{2} C \)
W
(C) \( E^{2} C\left(\varepsilon_{\mathrm{r}}-1\right) \)
(D) none of these
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