Four long, parallel conductors carry equal currents of I = 2.50 A. The figure be

Question

Four long, parallel conductors carry equal currents of I = 2.50 A. The figure below shows an end view of the conductors. The direction of the current is into the screen at points A and B (indicated by the crosses) and out of the screen at C and D (indicated by the dots). Calculate the magnitude and direction of the magnetic field at point P, located at the center of the square with edge of length 0.200 m.
http://www.webassign.net/pse/p30-19.gif

I already know the second part is "downward" but I am having problems calculating the first part and keeping getting the wrong answer.

Explanation / Answer

d=a/2

B=4*0*I/2dCos 45=10-5T

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