Three conducting balls with radii R1 = 10 cm, R2 = 20 cm and R3 = 30 cm and, accordingly, potentials j1 = 450 V, j2 = 300 V and j3 = 150 V are separated far from each other in a vacuum. What amount of heat Q will be released after they are connected by thin wires, the capacitance of which can be neglected?

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