Задача id9622

A flat air capacitor with a capacity C = 3.0 μF is connected to a constant voltage source U = 20 V (Fig.). What mechanical work must be done to increase the distance between the capacitor plates by n = 3.0 times? What work is done by the source? Consider two cases: 1) before moving the plates apart, the capacitor is disconnected from the source, i.e., switch K is open; 2) key K is always closed.

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