Question

Part A In the circuit in (Figure 1) the voltage and current expressions are v=36e 256 V, t>0; i = 20e-25 mA, t> 0+. Find R. Express your answer to three significant figures and include the appropriate units. μΑ ? R= Value Units Figure < 1 of 1 > Submit Request Answer Part B + Find C Express your answer to three significant figures and include the appropriate units. HE v R HA ? - C = Value Units

Answer 1

02 اح (lt) + C ν SR -25t VI+) = 36 e -25t ilt)=20 e МА t>O - 25+ ma → current flowing througes R= 20e voltage across R = Voltage across C - 5t V 1, 36 € 36e-257 -3 v=iR R bl- 520e-951 XID IR = 1-8 kor Current flowing through capacitor is given by {lt) = c d ůlt) dt here, icht)=-ilt) and H) = VH) - 25+ - 25t -3 7 20e XID -C d 360 at - 25t 200 -3 X10 - Cx36 (-25) e est 20x10 -3 22.22 MF IC - 36X25

Z > Rc - 108x10 3 0-6 x 22:22 X1D てこ 0.04 sec the ར since capacitor is discharging through resistor R, voltage across discharging Capacitor is given by -t/e Vit) = V(o) e with given en egn, we Comparing this egn. find that Vlo)=36v Initial energy stored in capacitor 2 2 EC) = Elo £c vlo) -6 Ix 22.22* 10 x 36 19 E(0) = 14.4 mg