How much work would be required to remove a metal sheet of thickness $l$ from between the plates of a capacitor (see the figure), assuming the battery remains connected so the voltage remains constant?(Figure 1)
Express your answer in terms of the variables $A$, $V$, $l$, $d$, and appropriate constants.
$W = -\frac{1}{2}\frac{\epsilon_0 A V^2}{d-l}$
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Part B
How much work would be required to remove a metal sheet of thickness $l$ from between the plates of a capacitor, assuming the battery is disconnected so the charge remains constant?
Express your answer in terms of the variables $A$, $V_0$, $l$, $d$, and appropriate constants.