$\mathrm{}\mathrm{}\mathrm{}\mathrm{}$$\mathrm{}\mathrm{}\mathrm{}$$\mathrm{}\mathrm{}\mathrm{}\mathrm{}$

Figure 10-38 2mV RG 50 www R R 470 RE 220 Rc 680 Vcc +15 V www RL 2.7 I 10-4 A11 resistances are doubled in Fig. 10-38. What is the ac collector resistance?