Question

i need 4e and 5b

4. For the circuit shown, the switch is initially open and the capacitor has an initial charge of 1 millicoulomb. a. What are the initial voltages on the resistor and capacitor? b. What is the capacitor voltage the instant the switch is 100uF closed? 7ΚΩ. c. What is the time constant, t, of this circuit? d. What is the capacitor voltage 50 milliseconds after the switch is closed? e. What is the capacitor's current 50 milliseconds after the switch is closed? f. What is the capacitor's charge 50 milliseconds after the switch is closed? g. How long does it take for the capacitor voltage to decay to 1 volt? h. What is the capacitor voltage after 5 minutes? 5. For the circuit shown, how long does it take for the capacitor to charge to six volts if: The capacitor has zero initial voltage? b. The capacitor has an initial voltage of 2V before the switch is closed? (EXTRA CREDIT) 1ΚΩ a.

Answer 1

-6 Solution 4) e) Time constant = v= R x C = 7x108x100x17 o. I=007 second. Potential difference across the capacito 10 V cinitially) = -3 toox to buy 100x106

78103 Initial current = 10 A = 1.428x10 A. let I be the current of ter 50 milliseconds. :, I = 10 A = 1.33x10 A -3 - 50 x 103 xe 0.7 3 7X10 . I 1•33 milliamperes. Solution 5) b) I=0.7 second! Initial Voltage =en final vol Let t be the time taken charge to 6v Voltage = or by the Capacitor to