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Homework Statement
Six infinitely long parallel wires, each carrying current +I in z direction, perpendicular to the (x, y) plane. They are spaced at angles 2pi/7 around a circle of radius d. A seventh wire, which would make the arrangement symmetric, is missing. What is the magnitude and direction of the magnetic field at point P at the center of the circle?
Homework Equations
∫B*dl = μ*I
The Attempt at a Solution
The solution to the problem is:
B*2pi*d = μ*I
B = μ*I / 2pi*d, in the negative x direction.My question is, why is B in the negative x direction? My method of understanding this is using the right hand rule, am I right with this method of thinking?
.......y
.......^
.....x......|
...o...o......|
...o...o....z.o---->x
...o...o
Looking at the drawing as seeing as the currents are coming out of the page, this would indicate your thumb pointing out of the screen. Force being your middle finger points down, because the magnetic attraction is heavier from the down region do to the lack of symmetry. Therefore leaving B, magnetic field(pointer finger) to point in the negative x direction. Am I correct in this method in determining why it is pointing in the negative x direction?