1. The current source, is(t), in Fig. 2 is represented by the single pulse of current shown in Fig. 1 while C=50F and R=4kQ. a. From Figure 1, derive the expression for is(t) as a unit-step function. b. Determine io(t), vx(t) and ix(t) for all time t and complete the entries in Table 1 (write the table in your answer sheets). i,(mA) io 20- i 10 Vx t (ms) 50 100 150 Figure 2 Figure 1 Table1 Time (ms) x lo Vx 50 1 2 50 4 6 50 150 19 20 21