=Electronics Hardware Questions=

Q:Sent by Tanh, VLSI engineer
What will be the voltage level between the two capacitors? The Vcc = 10v DC.

Hint from Hitequest:
Q1= V1*C1    //ammount of charge on C1
Q2= V2*C2    //ammount of charge on C2
Q = Q1 = Q2    //all caps in series have the same charge
(V-V2)*C1=V2*C2
V2=V*C1/(C1+C2)
V2=10*20/50=4V     //the result

from Hector M.:
there is an error on the question with the 2 capacitors in series (20uf and 30uf)....
The solution is 6 volts instead of 4 volts. The voltage divider formula is:
V=(C2.Vcc)/(C1+C2)

from Marin S:
My comment is related to the question sent by Tanh. As shown in the figure the required voltage is the voltage on the capacitor C2 (The voltage is always measured between two points). The response shown is correct.

Hector M comment is wrong - The voltage divider for the capacitors is V2= V*C1/(C1+C2) which obviously is not as shown by him.
His formula is an extension of the resistor voltage divider, V2=V*R2/(R1+R2)where R1 and R2 are the resistors replacing the capacitors in a resistor network.