Make quick corrections to four problems (Circuit, Capacitance, & Dielectric) Ima

Question

Make quick corrections to four problems (Circuit, Capacitance, & Dielectric)

Image link: http://imgur.com/a/afhPs
(Or see below)

EDIT: Also the switch is open (between B and R) in the first three problems

15. Consider the circuit below where C C2 C3 and the circuit has been in the state as shown for a very long time. sance MV a. (2) Describe how much charge is on each capacitor and explain why. olu g AV b. (3) Find the equivalent capacitance the capacitor arrangement. Include any intermediate circuits as capacitor combinations are made and show the equivalent circuit which with a single capacitor, C c. (4) C1 is made by placing two metal plates 10 with surface area of 0.25 m each and a 3.0 um thick sheet of Ethyl Aeetoneoxalate (k 16 l) is placed as the dielectric between them, AV 8.0 v and R 505 2. Calculate the time constant of the arrangemen 2 6 A V t/T 0,005 s s d. (4) If the switch is then moved to position B 2 3 4 5 6 7 8 9 10 at t- 1 ms draw the graph of the voltage vs time Time (ms across the capacitor combination in the space provided.

Explanation / Answer

15.a)

At T = (very long time), everything is assumed to be in steady state. If the circuit is purely DC, then no current will be flowing through any capacitor and you can replace all capacitors with open circuits for the purpose of finding the voltages of the circuit & then easily find the charge on each capacitors.

15.b)

C1 and C2 are in parellel & then their combination is in series with C3;

Ceq = (C1+ C2).C3 / (C1+C2+C3)

15.c) Time constant = R . C (you did that correctly)

15.d) Graph drawn above is correct (max voltage would be V, Imax = V / R,when there's no resistance due to capacitors(capacitive resistance) )

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