Can a Lagrangian be written for a simple RC or RL circuit?

[softport]

Hello,
is it possible to write a Lagrangian (L) for a simple RC (or RL) circuit?

Normally L = kinetic - potential energy, but how would you write
this for an RC circuit?

thanks!

 

[torquil]

You'd use the charge q(t) at some point in the circuit, as the unknown function in the Lagrangian fomulation. This turned up after searching for "rcl circuit lagrangian" on google:

http://www.phys.ttu.edu/~huang24/Teaching/Phys5306/CH2C.pdf"

 

[softport]

Thanks torquil, I didn't find this on my searches. I'll study it
and post back.

regards