time varying current

Hi,

im new in COMSOL and would like to know at first:

How can i simulate a time dependent electrical current. I guess, at first i have to choose the " Study Type - time dependent".

I would like to simulate a shortcircuit between two phases (two parallel mounted busbars) and by the way the lorence force caused by the shortcircuit over a defined period of time.

Has anybody an Idea which model from the model library could be useful - or maybe someone has a model that describes a similar problem?!

Thanks in advance

Sven