Capacitor Energy Stored Disconnected vs Connected

A parallel plate capacitor of capacity C₀ is charged to a potential V₀. (I) The energy stored in the capacitor when the battery is disconnected and the plate separation is doubled is U₁. (II) The energy stored in the capacitor when the charging battery is kept connected and the separation between the capacitor plates is doubled is U₂. Then U₁/U₂ is

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