Work done to pull the plates of an isolated charged capacitor apart to n times the separation

1. A.
   $\frac{3\varepsilon_0AV_0^2}{d}$
2. B.
   $\frac{\varepsilon_0AV_0^2}{2d}$
3. C.
   $\frac{\varepsilon_0AV_0^2}{3d}$
4. D.
   $\frac{\varepsilon_0AV_0^2}{d}$

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1. A.
   $\frac{\varepsilon_{0}{AV}^{2}}{3\text{ }d}$
2. B.
   $\frac{\varepsilon_{0}AV^{2}}{4d}$
3. C.
   $\frac{2\varepsilon_{0}{AV}^{2}}{\text{ }d}$
4. D.
   $\frac{3\varepsilon_{0}{AV}^{2}}{2\text{ }d}$

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