How to Calculate Flux Density at a Point Using a 3-A Current?

[LandonV]

Homework Statement

Someone else posted up this image on yahoo answers and my question is very similar except the numerical figures are different really.

http://s3.supload.com/free/Picture_258.jpg/view"

How can i solve for for the flux density at the point using the 3-A current?

Homework Equations

B = I x 10^-7 $$\int$$^lb_la (sin$$\Theta$$/r²)dl

The Attempt at a Solution

B=3 x 10^-7/.02m $$\int$$^lb_la (sin 90/2.5²).07m

I am no even sure if I am attempting this correctly. Everything I'm reading doesn't really explain the steps to get the answer. They give other examples that look nothing like my problem so I am lost as can be. Can someone help me out here?

 

[LandonV]

can no one help me out?