276 Practice Problem 7.10 20 www 60 ww Chapter 7 First-Order Circuits Find v(t) for > 0 in the circuit of Fig. 7.44. Assume the switch has been open for a long time and is closed at r = 0. Calculate v(r) at r=0.5. Answer: (9.375+ 5.625e) V for all > 0, 11.444 V. 15 V + F Figure 7.44 For Practice Prob. 7.10. 7.5 V plored for a long time and is opened at