To maintain undamped oscillations in the LCR circuit (L = 4•10-3 G, C = 10-10 F, R = 1 Ohm), the capacitance of the capacitor is quickly changed by the value DC each time the voltage on it is zero, and after a while t = 6.4•10-8 s return to its original state. Determine the magnitude and sign of DC.

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