Practice Problem 6.4 i (mA) A 100 2 4 6 t (ms) Figure 6.11 An initially uncharged 1-mF capacitor has the current shown in Fig. 6.11 across it. Calculate the voltage across it at t = 2 ms and t = 5 ms. Answer: 100 mV, 400 mV. Practice Problem 6.5 1 ΚΩ ww 3 ΚΩ 30 μF + 50 V 20 μF 6 ΚΩ Figure 6.13 For Practice Prob. 6.5. Under de conditions, find the energy stored in the capacitors in Fig. 6.13. Answer: 20.25 mJ, 3.375 mJ.