- #1
Nyasha
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Homework Statement
In the figure 29-49, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 20 cm. The currents are out of the page in wires 1 and 4 and into the page in wires 2 and 3, and each wire carries 19 A. What is the magnitude of the net magnetic field at the square's center?
http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c29/fig29_45.gif
Solution
I don't understand how they got the diagram with the directions of b1,b2,b3 and b4
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