physics

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The circuit in the figure below consists of two identical, parallel metal plates connected to identical metal springs, a switch, and a 130-V battery. With the switch open, the plates are uncharged, are separated by a distance d = 7.65 mm, and have a capacitance C = 2.00 µF. When the switch is closed, the distance between the plates decreases by a factor of 0.500.

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