An arrangement of four wires, in cross section, with θ=30° and u=5cm. Wire 2 and wire 4 carry the same magnitude of current (I2=I4=10mA) directed out of the page. Wire 3 carries current I3=25mA directed into the page.
If the resultant force per unit length on wire 1 is zero due to the other three wires, determine s, the distance between the origin and wire 3. Write your final answer in centimeters.
F/L = (μoIaIb)/2πd
The Attempt at a Solution
I try to equate F2/L + F3/L + F4/L =0
but now whats makes me confusing is I don't have the value of I1, so how should I continue it?