I am confusedbecause I do not know what it means by \"Resultant Circuit\" and ho

ID: 1830085 • Letter: I

Question

I am confusedbecause I do not know what it means by "Resultant Circuit" and howdo I find an expression for it? I am figuring an expression dealswith integrations but I have no idea where to begin. Heres thequestion with a link to the circuit:

1. Both switches J1 and J4 in Figure2 has been open for a long time. Draw the resultant circuit andfind the expression for the capacitor voltage after the switch J1closes at t = 0. R1 = 75 k?, R3 = 25.5 k?, C1 = 1.0mF, V1 = 12 V.

2. How long will it take for thecapacitor voltage to reach 11.999V ?

3. Switch J1 has been close for a long time. Now open the switch J1and close the switch J4 at time t = 0. Draw theresultant circuit (2 points) and find the expression for thecapacitor voltage.

4. How longwill it take for the capacitor voltage to reach 0.0001 V ?

Link tocircuit:

http://img30.imageshack.us/img30/9573/circz.png