# Magnetic force on a loop

Hi all

I tried to solve one of the magnetostatic problems and I end up with a trivial solution. The problem as shown in the figure, we have an infinite current carrying line and a circle with a radius "b" and current I2. The problem asks for the force being exerted by the line on the circular loop. My answer as it’s shown doesn't depend on "d" neither "b" which makes no sense.
http://www.pc4up.com/2009/5-2009/Jkc70408.jpg [Broken]

Can you debug my solution?

Last edited by a moderator: