Q4/ In Fig. 4, the switch has been closed for a long time and is opened at t= 0. Find v for all time. 20x12 R = 70+1³ 1-2-3A 6-61 40u(t) V 10 Ω www 20 Ω . +41 t=0 X F ((70) = 20V 20⁰-6 30 40*0.3=0- 30 V(0)=R=0-1420= 2 26-667-24-667e

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