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In the given circuit, When switch S is o...

In the given circuit, When switch S is opencd, the plates are uncharged and are separated by distance d=8.00mm. Battery is of 100V and springs are identical with spring constant K. Capacitance of capacitor with separation d=8mm is `2muF` . When switch S is closed, the distance between plates is reduced to 4mm. Find the sum of spring constants of springs.

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