I studied that inserting the slab into a capacitor which is connected to a battery is difficult and we have to do the work, and inserting the slab into a disconnected capacitor is easy and we don't have to do any work. is it right? if it is right then how the direction of the force on slab in both situation differs? I thought that in both situations slab is attracted by the capacitor and we don't have to do the work in both situations. why the capacitor is pushing the slab outside in first situation?
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