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Force constant of a spring when it is connected to a capacitor [closed]

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One plate of a capacitor is connected to a spring.Area of both the plates is A and separation is d when the capacitor is uncharged.When capacitor is charged,in steady state separation between the plates is 0.8d.The force constant of the spring is

closed with the note: insufficient effort
asked Dec 14, 2017 in Physics Problems by Nisi sunil (100 points)
closed May 14 by sammy gerbil
Welcome to the site, Nisi. Please note that you are expected to show some effort in your question. What attempt have you made? What difficulty are you having with the problem?

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