4. For the circuit of Figure 2, (a) Obtain an expression for vc(t) valid for all...

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4. For the circuit of Figure 2, (a) Obtain an expression for vc(t) valid for all t > 0. (6] (b) Determine ve at t 10 ms and t = 600 ms. [4] (c) Replace the 10 resistor with a 100 mf? resistor, and the 52 resistor with a 200 m2 resistor. Assuming the passive sign convention, obtain an expression for the capacitor current which is valid for t > 0. [10] 0.01 H 1=0 t=0 9 V 15F Su(-1) µA 0.2 n2 4 mF I mH 50 Figure 2: Circuit for problem 4 Figure 3: Circuit for problem 5 lll 4. For the circuit of Figure 2, (a) Obtain an expression for vc(t) valid for all t > 0. (6] (b) Determine ve at t 10 ms and t = 600 ms. [4] (c) Replace the 10 resistor with a 100 mf? resistor, and the 52 resistor with a 200 m2 resistor. Assuming the passive sign convention, obtain an expression for the capacitor current which is valid for t > 0. [10] 0.01 H 1=0 t=0 9 V 15F Su(-1) µA 0.2 n2 4 mF I mH 50 Figure 2: Circuit for problem 4 Figure 3: Circuit for problem 5 lll