142. Inside a parallel-plate capacitor there is a plate parallel to the outer
plates, whose thickness is equal to n=0.60 of the gap width. When the
plate is absent the capacitor capacitance equals c = 20 nF. First, the
capacitor was connected in parallel to a constant voltage source
producing V = 200 V, then it was disconnected from it, after which the
plate was slowly removed from the gap. Find the work performed
during the removal, if the plate is
(a) made of metal; (b) made of glass.
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sry I can't understand the question
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what is that is it ?
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answer is it ok
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