Figu Equivalent circuit for the circuit in Fig. 7.5. (II.) Ux v = 0.6(15e 12+8 Finally, of vin/% Practice Problem 7.1 80 www + 12 Ω 602 (CLT) at 1 smis of qu 101zas od yd bodrozda Ux ix = = 0.75e2A 12 vident from Tatted that after Sr. (vg time copstalv that the cuptor fully In other words, Refer to the circuit in Fig. 7.7. Let vc(0) = 60 V. Determine c... and i, for t≥ 0. jaib vileumbs et notisqu ammua al Answer: 60e-0.25 V, 20e -0.251 V.-5e-0.25/ A. tim F: how ad-yax pribo Figure 7.7 For Practice Prob. 7.1. alenia s anistroo Nuoro answ bne aiotelash lasvse brs 1ofice Example 7.2 101 1=0 342 ww 90 www 20 mF The switch in the circuit in Fig. 7.8 has been closed for a long time, and it is opened at t=0. Find v(t) for ≥0. Calculate the initial energy stored in the capacitor. Solution: nemu osiceqso) asldais at gribat al boniasish sd nea do For 0, the switch is closed; the capacitor is an open circuit to de. as represented in Fig. 7.9(a). Using voltage division 9 (1) 9+3 (20)=15