here is a question:

http://i25.tinypic.com/8xlcfl.gif

there is endless wire uniformly charged

and close to it located a wire with

which has 30 degree angle between him and the endless wire,and it charged in uniformed way so that the total charge on it is

the distance of the finite wire and the infinite wire is 0.08 meters

A.find the total force acted on the finite wire.

B.find it when degrees and when degrees.

gaus law for infinite wire i presume its length is l and distance r.

i sum along the finite wire

but the ditance from the infinite changes too.

so it should be a double integral

but its not a 2d body

??