You connect a battery, resistor, and capacitor as in Fig. 26.20a, where R = 12.0 Ω and C = 5.00 × 10^-6F. The switch S is closed at t = 0. When the current in the circuit has magnitude 3.00 A, the charge on the capacitor is 40.0 × 10^-6C.

(a) What is the emf of the battery?

(b) At what time t after the switch is closed is the charge on the capacitor equal to 40.0 × 10^-6 C?
(c) When the current has magnitude 3.00 A, at what rate is energy being 

(i) Stored in the capacitor,

(ii) Supplied by the battery?

Fig.26.20a

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