Four long, parallel conductors carry equal 7 A currents. Across-sectional view o

Question

Four long, parallel conductors carry equal 7 A currents. Across-sectional view of the con-
ductors is shown in the figure. Each side of the square has lengthof 0.7 m. The current
direction is out of the page at points indicated by the dots andinto the page at points
indicated by the crosses.
http://i49.tinypic.com/2rwq5c4.jpg
Which of the diagrams correctly denotes the directions of thecomponents of the
magnetic field from each conductor at the point P? The permeabilityof free space is
4 × 10^7 N/A2 .
http://i50.tinypic.com/30x9bmx.png
Part B:
What is the magnitude of each of the four components BA, BB, BC,and BD at the point P?
Answer in units of T.
Part C:
What is the magnitude of the magnetic field at point P?
Answer in units of T.

Explanation / Answer

I = 7 A, a = 0.7 m, r = a/2 A) no. 3 B) BA = BB = BC = BD =0I/(2r) = 2.83*10-6 T C) Bp = BB + BD =5.66*10-6 T

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