Four circuits have the form shown in the diagram below. The capacitor is initially uncharged and the switch S is open. Rank the circuits according to the amount of time after switch S is closed for the capacitors to reach half their final charges, least to greatest. The values of the emf E, resistance R, and capacitance C for each of the circuits are   E = 12V, R = 1Ω, C = 7μF E = 18V, R = 3Ω, C = 1μF E = 10V, R = 5Ω, C = 7μF E = 18V, R = 6Ω, C = 9μF

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