The above diagram is a circuit that consists of three capacitors **A**, **B** and **C** with capacitances \(C_0,\) \(2C_0\) and \(2C_0,\) respectively. The voltage of the power supply is constant. Let \(E_1\) be the electric energy charged on capacitor **A** when the switch **S** is open. Let \(E_2\) be the electric energy charged on capacitor **A** when the switch **S** is closed. Then what is the ratio \(E_1:E_2?\)

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