Magnetic field due to many wires

[cutesteph]

Say I have three parallel wires facing north east that run through a square. The first wire goes through the top right edge. The next wire goes through the top left edge and the last wire goes through the bottom left edge. There is a point on the last edge of the square.


When calculating the magnetic field on the point, do the wires affect each other's magnetic field's effect on p? I am also having trouble setting up the direction of where the magnetic field.

 

[jtbell]

do the wires affect each other's magnetic field's effect on p?

No. Calculate the field produced by each wire, and then add them together as vectors. This is the "principle of superposition."

I am also having trouble setting up the direction of where the magnetic field.

Use the right-hand rule to determine the direction of each individual wire's magnetic field at p. As noted above, you add those fields together as vectors.