Question

In the figure, the two long straight wires are separated by a distance of d = 0.40 m.


In the figure, the two long straight wires are separated by a distance of d = 0.40 m. The currents are I1 = 1.0 A to the right in the upper wire and I2 = 8.0 A to the left in the lower wire. 

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A. what are the magnitude and direction of the magnetic field at point P, that is a distance d/2 = 0.20 m below the lower wire? 

B. What are the magnitude and direction of the magnetic field at point P if the current in wire 2 is reversed?

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