Circuit Analyses: Find E3 Given Diagram

[polymerase]

The questions says that it doesn't matter if the switch is open or closed.

It asks, what is the emf E3 in terms of the other quantities shown.

I have attached a diagram of the circuit.

Thank you in advance.

 

[polymerase]

can anyone help me with this question please...

 

[chroot]

It definitely matters whether the switch is open or closed. If the switch is open, one terminal of the capacitor E3 is floating, and it could potentially have any voltage you can imagine across it.

If the switch is closed, just write two KVL equations around each loop, and then use algebra to combine them.

- Warren

 

[polymerase]

It definitely matters whether the switch is open or closed. If the switch is open, one terminal of the capacitor E3 is floating, and it could potentially have any voltage you can imagine across it.

If the switch is closed, just write two KVL equations around each loop, and then use algebra to combine them.

- Warren

they are NOT capacitors they are batteries, E1 and E2, and E3 are all batteries...

 

[chroot]

Okay. I'd advise that you use schematic symbols that are more universal, but that's okay. My advice remains: pick a reference node, write KVL around each loop, and solve for whatever variable you want.

- Warren