How I find value of U on R2 long time after switch is closed

AI Thread Summary
To find the value of U on R2 after the switch is closed for a long time, it is essential to recognize that the capacitors become fully charged, resulting in no current flowing through them. The current will only flow through resistors R2 and R1. The equation derived using Kirchhoff's rule, U = Uc1 + Uo, is correct, but the calculations need careful verification. It's important to note that if no current flows through a component, it can be omitted from the circuit for simplification. Understanding the behavior of the circuit after the switch is closed is crucial for accurately determining U.
nisamto
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How to find value of U on R2 long time after switch is being closed?

Capacitors are charged so there is no current going through? Or?
I used kirchof rule so i get
Uo+Uc1-U=0
U=Uc1+Uo
U=R2/(R3+R2+(R1R/R1+R))*Uo

Is this correct or?

If not can someone do this example and explain me :)
 
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Is this homework? If so, I should be posted on the homework forum.

According to your diagram, if no current is passing through the capacitors, then current flows only through R2 and R1. Can you do the rest?
 
anorlunda said:
Is this homework? If so, I should be posted on the homework forum.

According to your diagram, if no current is passing through the capacitors, then current flows only through R2 and R1. Can you do the rest?
No. How come that there is current throught R1?
 
nisamto said:
No. How come that there is current throught R1?
Because with the switch closed there continues to be a current path through R1 even after the capacitors have charged.

http://www.imageshack.com/a/img109/4666/holly1756.gif
 
Last edited by a moderator:
Hint: If there is no current flowing through a component it can be removed from the circuit without affecting anything. Try redrawing your circuit with any such components replaced with an open circuit.

Edit: Actually this is not always true but try it anyway.
 

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