43. The capacitor in Fig. 10.111 is initially charged to 10 V with the polarity shown. a. Write the mathematical expressions for the voltage vc and the current ic when the switch is closed. b. Sketch the waveforms of vc and ic. R₁₂ 1.5 ΚΩ 1=4 mA R₁ 6.8 ΚΩ FIG. 10.111 Problem 43. + ic UC C 2.2 uF 10 V #4