calculating magnitude of a wire?

Question

The two wires in Figure P19.40 carry currents of 3.00 A and 5.00 A in the direction indicated. (a) Find the magnitude of the magnetic field at a point midway between the wires. (b) Find the magnitude of the magnetic field at point P, located 20.0 cm above the wire carrying the 5.00-A current.
http://www.webassign.net/sf5/p19_39.gif....

I have found the answer for part a) to equal 4.0e-6 can anyone confirm this. I need desperate help on part b

Answer 1

Regrettably, your webassign link does not point to a valid location. Can you please edit your question? I might be able to help you then.