The electrical circuit shown schematically in the figure consists of three capacitors with capacities C1, C2 and C3, a coil of inductance L and a source of constant voltage U0. At the initial moment of time, the capacitors are not charged, and the current in the coil is zero. The switch K is shorted. Find the maximum current Imax through the coil and determine the minimum voltage Umin across the capacitor C2. Assume that the resistance of the connecting wires is rather small.